Nicholas and Susan meet Merle the Pearl, a local minor league baseball player. Nicholas is upset that his young girlfriend is moving out of town and wants to introduce her to Merle the Pearl to impress her before she leaves. Frustrated by the gas shortage, Tom agrees to buy a new, fuel-efficient car. Merle falls for Susan and Nicholas gets his first kiss

David returns and is determined to win Janet back from her new boyfriend. Merle confides to Nicholas that he wants to propose to Susan but Susan is upset when the entire Bradford family knows about before she does. Nicholas acts as the go-between for everyone

David and Janet set a wedding date but it turns out to be the same day Merle and Susan decided to move up the wedding day to accomodate Merle's ballplaying career move. Nancy gets a job delivering singing telegrams and is hired to deliver one at the double wedding for David and Janet and Merle and Susan.

Things are not as they seem at the Bradfords when Merle's sister, Linda Mae, comes from the farm and visits the Bradfords and is shocked at what she finds. Joannie talks Nancy into playing a stripper in her play. Susan panics when she hears that Merle was injured in a game. It's a comedy of errors when Linda Mae calls the police after misunderstanding the family's crazy life style.

Tom's sister Vivian sweeps into town with an offer to take the entire family on vacation to Hawaii, where she secretly plans to reunite Tom with their estranged father.

Still in Hawaii, Tom and his father contemplate whether they can or should bother to reconcile their relationship.

When Tommy is rushed to the hospital for emergency surgery, Mary and Nicholas both feel culpable for different reasons; Merle and Susan adjust to the give and take of married life; Nancy plays travel guide for a visiting colleague from China who doesn't speak English.

The furnace is on the blink, causing a cold front in the Bradford house, but Tom dismisses Mary's offer to fix it; Susan's chance for an internship conflicts with Merle's offer to play winter ball in Puerto Rico; Nicholas goes on strike for a raise in his allowance.

Tom and Abby believe that Susan is depressed because Merle is gone but learn that she is pregnant. The girls try to cheer her up. Joannie meets a psychic and holds a seance to help Susan. Merle arrives to win her back and finds out she is going to have their baby. Ernie and Tommy use Nicholas as bait to meet girls.

Abby tries to cheer Tom up on his 50th birthday. Tom feels the pressure of teh youth movement at work and believes that the Register wants to replace him with a younger columnist. Merle and Susan try to pick names for their baby. Nicholas is helping Merle come up with a name for the new baby.

Merle recruits the girls for a charity basketball team. Tom is jealous when a publisher offers to publish Abby's thesis and Tom can't get his accepted. They pool their efforts, after competitive feelings are straightened out, to co-author his book. Nicholas gets his friend's mom a job helping with the book. Nicholas's friend is upset to learn that his mom works for Abby and not the other way around.

Joannie gets an important assignment at work but Jeffrey believes that the boss will be expecting a favor in return. Joannie blows her chance at a big story. An experienced reporter makes her his partner and the result is an important scoop. Nicholas has a problem with a bully that he can't hit back. Fed up with the way that Tom divvies up the family's discretionary funds, Tommy takes over budgeting for it.

Nicholas and Tom start boy scouts and Nicholas volunteers Tom to be the assistant scout master. Elizabeth considers moving in with her boyfriend. Susan keeps her pregnancy problems from Merle when his career takes a leap forward.

.

Ernie introduces Tommy to a slightly older songwriting woman who has a 4-year old son. When he falls for her, she has second thoughts. The Bradford's convert the garage into an apartment for Susan and Merle. Nicholas supervises the conversion job. Jeremy begins to feel like part of the family when Abby enrolls him in school and Tom makes him follow the household rules.

Joannie involves David in the renovation of an old opera house. However, Janet is the legal counsel for the developer who wants to build low-income housing on the site. Nicholas gets a horse from Joe Simons and Abby help him find a way to keep it. Merle returns home from the New York Mets, but Susan is too tired from taking care of Sandra Sue to enjoy his visit.

Merle suffers a career-ending shoulder injury and doesn't know what to do if he can't play baseball. Merle comes upon Nicholas and his friends playing ball. He is offered a job of assistant coach of the High School team. One of Mary's patients falls in love with her and won't leave her alone. Eager to earn more money, Jeremy gets a job convincing people to try experimental products.