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.
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.
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.
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.
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.
Paul's backyard fence is discovered to be a foot onto his neighbor's property so he's asked to move it but Howie's research indicates that the fence is in the correct location.
Paul pulls a muscle in his back before he's scheduled to attend a dance with Martha but when the injury heals he keeps on pretending in order to get out of attending the dance.