Jessie's older sister comes for a visit; Molly recovers from a tonsillectomy; David has a crush on the pretty teacher who runs the computer club; Gus is upset when David finds an old manuscript of stories in the attic.
Molly befriends a new classmate named Dana who is blind, and tries to understand what Dana experiences by wearing a blindfold. Meanwhile, Gus is opposed to allowing a successful female attorney to join his all male service club. And fire safety becomes an important issue in the household.
Gus's friend Lou Lefkowitz dies and his last request is for Gus to deliver a moose head to Lou's first love Lila; Kris's busy social life makes Jessie feel neglected; and David makes a new friend in a talented but unhappy tennis player.
Kris tutors a girl to help the hard luck student win a scholarship; David is impressed by the storytelling plumber hired by the Witherspoons, but Gus is not; Molly is led to believe that she qualifies for the gifted class.
A young man delivers a letter to Gus at his late mother's request which reveals that his father is Gus's old friend J.J. Moon; J.J. is reluctant to accept fatherhood; David's Japanese-American classmate doesn't want to debate Hiroshima, putting his and David's grades in jeopardy; Kris shops for a formal dress; Molly takes care of Bertha's pet rat, Pookie, who winds up loose in the Witherspoon house.
Kris wants to take flying lessons, but her mother disapproves; Gus decides to go back to work and needs a bank loan to buy a truck; Jessie enjoys taking care of a baby whose mother abandoned him; David is about to turn thirteen; Molly is worried after a series of tremors hits the area.
Gus is trapped in an elevator with the baby after an earthquake; Kris is a passenger in a small plane without Jessie's permission; David becomes friends with a handyman while his class is stuck at a church in the country, then tragedy strikes; Jessie is reluctant to give up the baby.
During a teachers' strike, Gus substitutes at Kris's school, and Kris supports the picketers; Molly and Bertha have a falling out over potential sweepstakes winnings; Jessie's new boss gives her a beeper.
David and his friends go on an overnight camping trip without permission to search for buried treasure after finding an old map; Gus goes to work at a stable and discovers a mutual attraction with his pretty employer.
A tough ROTC instructor causes Kris to doubt her dream of going to the Air Force Academy; Gus's service club plans a memorial for Vietnam war dead and Gus can't understand Lt. Col. Trask's ambivalence towards it; Molly grows squash and befriends caterpillars; David regrets his gift to a pretty classmate.
Encouraged by memories of his father's past glory, David joins the school basketball team, but doesn't enjoy it; Molly and Bertha mistakenly believe Mr. Kaplan is dying; Kris and Nikki have a falling out after Kris accuses Nikki of keeping secrets; Jessie dates an old friend.
When Gus takes the family and Joe Kaplan to a friend's cabin for the weekend, they unexpectedly meet the friend's son, a troubled professional football player; David makes an expensive bet with J.R.; Molly works on a poem for school.