Charley (William Demarest) is tired of having Fergus living in the Douglas house, causing a disruption to everyone's schedule. Since Fergus is looking for a wife, Charley places an ad in the local newspaper, seeking a wife for Fergus.
Steve's cousin Fergus (Fred MacMurray in a double role) and Terri (Anne Francis) go to the bowling alley, where she works as a waitress, and have dinner. Fergus proposes, but Terri declines as she is afraid of the move to Scotland. Steve talks to her and she says yes.
Everyone has a busy day, and no one has time to take care of the triplets. Steve decides to take care of the boys by taking them to work, and asking his secretary to take the day off to care for them. Steve then forgets where she lives.
Chip asks Polly to stop buying useless things as their apartment does not have enough room. When she goes shopping again, a salesman tells her she can have a free set of cookwares - if she hosts a dinner party for eight people that night.
Babara (Beverly Garland) is enthusiastic about everything that involves Steve (Fred MacMurray) and his family, almost to an embarrassment with Steve. When Steve asks her to join his partners and their wives at a bowling match, she is afraid of letting him down.
Katie (Tina Cole) wants to do more than just stay at home with the triplets, so she gets a job singing in the evenings at a small coffee house. Steve (Fred MacMurray) and Charley (William Demarest) worry about her, but once they meet the owner (Anthony Caruso), they realize Katie is in good hands.
Polly wants to learn more and experience more so that she is more interesting to Chip. Since Ernie sees her going out a lot without Chip, he start to think there is something wrong with their marriage.
When Katie (Tina Cole) is out with the triplets, a talent scout notices the boys and wants them to be in a television commercial. While filming, the boys act out since they are afraid. Steve ends up in the commercial so the boys feel more comfortable.
Katie (Tina Cole) gets a temporary job as a secretary, and decides to put the boys in a child care center, so that Charley (William Demarest) is not bothered with three young boys. Soon Charley goes missing every day from home at the same time.
Dodie's school has a fund raiser to send to Korean orphans. She tells her teacher that her father will help divide the peanuts in a large sack into smaller bags for the sale. The whole family works all night to complete the task.
Barbara (Beverly Garland) is not feeling well, but finds out she has to take care of the children and the house by herself. When she cannot take it anymore, she walks out the house without telling anyone.
Katie (Tina Cole) and her friends talk about their husbands. Katie misses Robbie and wonders if she should start living her own life without him. Meanwhile, Dodie (Dawn Lyn) has a slumber party with her friends.
Chip's (Stanley Livingston) old friend, John Simpson (Micky Dolenz), who's now a big rock star, pays a visit. Soon, Chip tells the family that he's decided to give up his studies and become a rock star, too. The family is extremely concerned--until John mentions that he makes $2 million a year.
Steve's boss and his wife count on the Douglas family to help them deal with their rebellious teen-aged son, Gordon (one of Ernie's classmates) after they suspect that the boy has fallen into drug use.