When Bub decides to fly to Ireland to visit his 104-year-old aunt, Steve says he can take care of the house while Bub is gone. Steve thinks woman make it seem harder than it really is. Soon, Steve has to eat his words.
Robbie's latest girlfriend takes him to the country club. When he gets home, he tells his father he should job the club because it is where the important people gather. Steve tells Robbie you do not have to be in a club to be important.
The Douglas family plans a vacation to Hawaii, but Chip gets sick and the trip is canceled. Charley decides if they cannot go to Hawaii, then Hawaii shall come to the Douglas'. He plans a luau party in the backyard.
Charley runs into a friend from his vaudeville days on the stage. Since she looks great for her age, Charlie thinks she might have found the fountain of youth. She tells Charlie he just needs to enjoy his life.
Sally talks Mike into submitting their names for a computer love match program. She is upset when the computer does not match them together. Mike asks Steve to submit profiles for his parents who are sure to match each other.
There's a new dog in town, and it looks like Tramp. Prince is a pampered pet of a rich neighbor. The dogs get mixed up by the owners, and the families are bewildered by the personality changes of their pets.
Uncle Charley takes Chip with him when he attends a reunion dinner with his vaudevillian friends. Chip meets a girl there that he likes. When he loses one of his shoes, he feels like Cinderella at the ball.
Sally's mother arrives in town two months before the wedding in order to help with the final preparations. When she starts handing out assignments to everyone from a long list of chores, Mike starts to daydream about easier weddings.
Mike and Sally are married as Tim Considine makes his last appearance on the show. Mike thanks Steve for everything before he and Sally head off to his new job out of state. Back at home, the attention turns to newly-orphaned Ernie.
With Mike & Sally married, the family prepares for Ernie moving on to his new foster family. Chip asks his father if they could take Ernie in rather than a foster family. When the social worker arrives, Steve considers asking her out.
Uncle Charley is upset when Robbie leaves for a date at 11:30 p.m., but Steve tells Charley not to worry because Robbie has commonsense. When Charley finds out he is dating a chorus girl, he is sure Robbie's future is doomed.
Steve takes the children to see the circus and they have a full day of entertainment. When Ernie wakes up overnight saying he sees a lion in the yard, Steve thinks it is just an overactive imagination. Then Steve sees the lion.
Chip has eyes for Mary Lou who is one year ahead of him in school. Mary Lou only has eyes for Robbie who is one year behind him in school. When Chip calls Mary Lou to ask her out on a date, she mistakenly believes it is Robbie and says yes.
Ernie volunteers Steve for a father & son show, but Steve is supposed to be out of town that day. On the day of the play, Steve changes his plans. Everyone goes to the school ahead of Steve, who is then stuck in costume and cannot drive.
Uncle Charley provides the correct answer to a radio contest and wins one dance lesson. His instructor is a pretty woman who is also skilled in sales. Charley buys her lines and purchases more lessons.
Robbie is recommended to take a ballet class by his football coach, to improve his coordination. All goes well, until Robbie is expected to perform at an upcoming ballet recital, against his "masculine" instincts. Will he perform?
When Steve has to fly to Hong Kong on a company plane for business, he decides to take the entire family for a vacation. Everyone is excited except Charlie, who is not sure he wants to see the modern city. He knew the city years before.
Charley overhears Steve on the phone arranging a marriage; Chip and Ernie learn he is arranging the church; and Robbie sees him at the jewelry store. More coincidences occur, all pointing to Steve getting married.
Robbie tells Chip that teenage parties are the best, so Chip decides he should throw his own party, with girls. Ernie is not invited since he is too young. As the party starts, the record player breaks. Ernie comes up with a solution.
Steve gives Robbie $50 to pick up his golf clubs. Since the store is not opened, Robbie goes to the pool hall. Two girls bet him to a game. They are pool sharks and win all Robbie's money. Charley plays pool shark and wins the money back.