Chip asks Steve's permission to elope, but before he grants it, he insists Chip give Mr. Williams the courtesy of asking his approval too. Chip goes to see Mr. Williams only to have him accusingly flaunt a private detective's report. Realizing that Polly's own father had hired a man to trail them, he storms out before asking for her hand.
Robbie is asked to be the best man at the wedding of an old friend from Bryant Park. He decides to go back a week early to show Katie around the town where he grew up but ultimately makes a disappointing visit when he realises that time and years do change things.Watch Now:Amazon
Steve Douglas is promoted to head up the Airflight Helicopter Division and the unmarried female employees quickly check and discover that he's a widower. Robbie's wife Katie takes a tour and Uncle Charley passes his girlfriend off as Steve's wife. When two Mrs. Douglases visit Steve at his new job, his employees suspect that he's a bigamist.
Against his classmate's better judgement, Ernie uses the unwitting Douglas household as guinea pigs for an experiment assigned by his psychology teacher. He cuts inches off Uncle Charley's cane to make him think he is growing taller. Ernie soon finds his father Steve is a little less gullible.
Dodie and some of her girl classmates in the second grade get a big crush on Mr. Turley, their new teacher, and right away they make a batch of cookies for him. Dodie's crush begins to fade when she finds out that her Mr. Turley was once one of Barbara's students.
Robbie Douglas displays a bit of jealousy when his bride innocently agrees to tutor a handsome student. Later, Katie confides to Uncle Charley that he was once her steady boyfriend, and Charley off-handedly warns Katie to be careful because Robbie has a jealous nature.
Chip learns the meaning of empathy when he helps Ernie out of a predicament when he somehow winds up with two dates with two different girls for the same dance, when he doesn't even like girls to start with.
Because he is about to become a Grandfather, Steve has an easier time working out an important Air Force contract with a hard-shelled General. By watching the way Katie walks, the General predicts that she will have a baby boy. Meanwhile Ernie decides to run for class President at school.
Controversy erupts in the Douglas household over the selection of a doctor for Katie during her pregnancy. While Robbie and Katie want to choose their own doctor, Katie's mother insists on making an appointment with the Miller family doctor. Meanwhile, Steve stands in for an absent Robbie at his first baby class.
Robbie and Katie pick a wedding date two weeks off. Katie's sorority sisters decide to do some private investigating on their own. Prospective groom Robbie then undergoes the complete once-over by his fiancee's family and runs the gamut of numerous cousins, aunts and a crotchety grandmother.
Barbara suspects that a promotion for Steve maybe in the works and as her suspicions become stronger, a routine investigation on Steve's family background turns up some rather startling information when it focuses on Uncle Charley.
Young Ernie Douglas becomes the unwilling object of the affection of Dodie's six year old friend while Barbara is asked by the Board of Education to take a substitute teacher's job at a local high school. She finds her stepson Chip in the class and he embarrassingly becomes her prized pupil.
The Douglases move to California, where at first they are depressed to find the residents as chilly as the weather is warm. Robbie enrols in the University and is totally captivated by a blonde girl, and Uncle Charley is initiated into the rapid-fire procedure of shopping in supermarkets. The family begins to feel that their next door neighbors represent the characteristic stand-offishness of all Californians until they discover that they moved into the neighborhood the day before they did.
Level-headed Katie becomes a jealous, suspicious wife when a pile of circumstantial evidence stacks up against Robbie, as she suspects him of seeing another woman.
The baby stirs inside Katie and Robbie feels its movement and suddenly sheds his youthful ways to become very much the sober and altogether too serious expectant father. Meanwhile, fatherhood is taking a different approach when Tramp's puppies to the next door neighbor's dog Francis, are about to be born.
The day before her wedding Katie Miller feels she faces complete disaster. When Robbie tries to console her, she flares up at him and after a short argument, the pair declare the wedding is off. Of course, Grandma Collins thinks otherwise.
Steve and Barbara have different ideas on how their wedding should go.
After a series of events at which the Bride and Groom wonder if they are doing the right thing, Steve and Barbara have an argument serious enough for them to consider cancelling their wedding.
The Douglas family cancels a camping trip to play host to unexpected Chinese friends from Bryant Park who are en route to Hong Kong and this ultimately upsets their Chinese relatives when they are asked to stay overnight.
The first time Robbie and Katie entertain at home they imperil the marriage of two close friends, Denise and Larry. Denise insists on playing a game in which each player tells what he dislikes about the other. After various uncomfortable truths are revealed, Denise angrily storms out insisting on a marital separation.
Uncle Charley persists in singing an old song about a guy who steals his best friend's girl. Chip listens with some sorrow but there is a misunderstanding that almost ruins the friendship between Ernie and his pal when Shorty sees Ernie walking to the movies with a new girl in the neighborhood.
While the family is doing some spring cleaning, Katie faints behind the couch. Soon her mother's intuition brings her to the house and she announces that Katie is going to be a mother. Once it is confirmed by a doctor, the family dotes on Katie, but seems to ignore the father to be.
When Robbie and Katie announce that they might hire a baby nurse, Uncle Charley is confident they will ask him. When they don't, he embarks on a marathon of baby sitting so he can learn the ropes by hiring himself out as a professional baby sitter.
Early on his wedding day, Robbie Douglas and his family are peacefully oversleeping. They awaken just in time and scramble madly to get ready as Robbie and Katie are soon married amid traditional confusion and tears. The lost family dog, Tramp, returns in time to join the family in the front pew.
In an advanced stage of pregnancy, Katie suffers qualms about her looks that are as out of proportion as her figure. She is temporarily distressed by her hugeness until she learns from her doctor that she is going to have more than one baby.
As the triplets come home from the hospital their names are announced by the happy parents: Robbie Jr, Charley and Steve II. Their father Robbie finds that he is totally unprepared for all of the attention that the infants attract.
Ernie remains at home with Uncle Charley while the rest of the family travel to various locations. Charley invites an old friend to dinner, believing him to be down and out. However, Ernie immediately identifies their guest as a famous television sherriff and he invites the two to the studio.
At school, Ernie meets Mike, who offers to play with him, but the family is exasperated to know Mike likes tomboyish pranks. Then there's a problem persuading Ernie to accept his new friend when he learns that she's really a girl.
Robbie and Katie have been invited to a High School reunion and they are reluctant to leave their babies with an unknown sitter as everyone in the family is otherwise busy. They hire a professional sitter that is recommended by the family doctor.
The contractor that Steve hires to add a baby alcove to Robbie and Katie's room leaves much to be desired. He displays all the charm of a top sergeant and is putty in Katie's hands, but is exasperatingly gruff and non co-operative to the males in the Douglas home.
Steve meets an attractive widow who seems to be very interested in him but suddenly she turns cool towards his intentions. The family does its best to give the impression that Steve isn't really as old as he seems.
One stormy night while Steve is in San Francisco, Katie is alone in the Douglas house while the rest of the family is attending a ballgame. Her tenseness builds as late in the night she hears a scary rythmic noise, and hysterically calls Steve to report that the family has not yet returned and that she hears a loud thumping sound.
Although Katie confidently calls the look-alike triplets by name, other members of the family doubt her accuracy, and when Steve helpfully bathes them, she admits that she can no longer tell them apart because he washed off the inkdots put on their feet. They must be taken back to the hospital for proper identification.
Ernie and his friends sell two used tires they found in the family storage room so they can buy a water rifle, but they cease to enjoy their 'cops and robbers' games when the real cops turn up after Uncle Charley calls them.
The day -- or rather the night -- of the big event finds expectant mother Katie quite calm, and Steve and Uncle Charley quite the opposite, and a hapless father to be off on Army manouvres. At the hospital, Katie gives birth to identical triplet boys and Steve must adjust to the fact that he is a Grandfather, three times over.
Chip manages to outwit the machine age when a computer is used to select partners for picnic dates for the boys in his class and girls from another school. He is soon startled to find that his date, although sweet and likeable, is six feet tall.
It may not be poker, but nine in the Douglas family is a full house. Feeling somewhat responsible, Robbie decides to quit school in order to pursue work full time and find a new home for his family. A wise school counsellor takes steps to discourage the move. Meanwhile Steve designs some plans for an extension to the house to accomodate the babies further.
The Douglases feel that Steve is becoming sedentary, not knowing that he's just been assigned to help capture some enemy agents, but things get rough when he's taken to a Greenwich Village cocktail party where the spies start shooting when they find him hiding in the bathtub.
With three babies to look after, Dr. Osborne says Katie is completely exhausted and he prescribes a couple of days bed rest. She flies to Santa Barbara to be with her mother. While she is away the family must hire three cleaning ladies to restore the house back to normal.
Attractive lady engineer Eileen Talbot is assigned to help Steve Douglas on a rush project in his office, and she applies her many talents to assure romantic, as well as technical success. Only level headed Katie recognizes her as a manipulating female long before the gullible male Douglases do.
Chip invites his neighbour's long-haired, guitar playing boy from Liverpool as a key addition to his off-key rock and roll band. The English lad's soft, folksong guitar is a disappointment and obviously won't work with the raucous amplified trio, but he helps them to win a trophy in an amateur talent contest.
Steve Douglas gives Chip a well-preserved second hand car for his 16th birthday but he is astounded by his son's unenthusiastic reaction; he is embarrassed to drive it, and parks it a long way from school so he won't be recognized as the old car's owner.
With his father Steve busy over the weekend, Chip suggests that newlyweds Robbie and Katie act as chaperones to him and his friends at a mountain cabin. At Katie's insistence, Robbie keeps strict checks on the three teenage couples.
A series of strange coincidences make young Ernie feel he's a jinx to anyone he contacts, but his father assures him that he has a loyal family who loves him in spite all of his trouble, and that they will stick by him no matter what.
Chip and his girlfriend announce to a startled Douglas family that they plan to marry and continue high school. Disapproving, Steve visits the girl's parents but they decide not to forbid the marriage but wait for further developments. When Katie becomes ill and Robbie takes her to the doctor, Chip and Debbie are left with the triplets for some hectic hours.
Katie is worried when Steve invites her visiting Aunt to spend a week at the house while he is out of town. Before long, she is molding the entire household into her image of a cultured family. When she slips some money under Katie's pillow, the girl angrily announces that this behaviour cannot continue.
Bored because he has been left at home alone on a day off from school, Ernie goes on a search for movie stars. The boy loses his footing on a steep path and falls into Zsa Zsa Gabor's swimming pool in Beverly Hills. The glamorous lady invites him in until his clothes dry and later takes him to a real movie studio. Now the whole family as well as the police are searching for Ernie.
Uncle Charley is talked into buying an 11 year old trotting horse in the hopes of capturing old racing glories. The family is delighted when they hear that the horse, driven by Uncle Charley, has qualified for a race after winning a trial competition.
Robbie goes to Camp Roberts for two weeks military reserve training. At home, Steve becomes alarmed when he sees Charley's card telling him that he and the boys who are camping at Yosemite, plan to look Robbie up at camp. But he arrives too late to divert them and one-by-one each member of the family is inadvertently caught as a military prisoner.
Dressed as a chorine named Apple Annie at his Lodge 'Frolics' night, a weary Uncle Charley awakens from a nap after a matinee performance and is forced to walk home and is arrested by the police for hitting a flirtatious man.