Attorney Paul Simms must adjust to the presence of his new son-in-law in his home. It seems as though the boy is a genius who can't seem to find a job.
When Howie gets chosen to compete on a quiz show, Paul hopes that he will win enough money to move out of his house.
Howie and Barbara decide to move out of the upstairs apartment but they only move to the basement.
When Howie gets a part in an all-nude play, Paul tries to prevent it from opening.
Howie ruins Paul's expensive new briefcase. Paul's subesequent tirade causes Howie and Barbara to move out of the house to a commune. Martha then persuades her husband to ask them to move back.
Paul is unhappy with his job when he receives time off instead of an expected cash bonus. Howie then mistakenly thinks that the Simms' are broke.
Howie and Barbara discover that they aren't legally married due to a technicality: the license of the minister who married them expired before the wedding. A new wedding ceremony is then held at the Simms' pool.
14 year old Sally has her first steady boyfriend. She's happy with the situation but the same cannot be said for her father.
Paul's sister, Charlotte, arrives for a visit at the same time as a potentially big Japanese client does. Paul then jumps to the conclusion that sis and the client are fooling around.
After her husband flirts with Martha at a party, a wife leaves him and moves in with the Simms'. It's a hard road to reconciliation especially since she wants to return to her old show biz career.
Aunt Charlotte returns only to find herself on the opposite side of brother Paul in a mayoral election.
Amazingly, Howie brings the man who tried to mug him and Barbara home for dinner. The good deed does not go unpunished when the mugger pulls a gun and begins ransacking the Simms house.
In order to get his blood pressure down, Paul tries extra hard not to let Howie's antics annoy him but Howie thinks that Paul needs to vent so he goes overboard to make his father-in-law angry.
For therapeutic value, Paul writes a nasty letter to his boss never intending for it to get mailed. Unfortunately, the letter does get mailed and chaos ensues.
When his mother-in-law stays and stays and stays, Paul arranges for her to win a free trip in order to get rid of her.
After an argument, Barbara moves upstairs with Martha while Paul is forced to share the basement with Howie.
Paul demands that the family spend more time together instead of doing their own things but they are miserable as a result.