Gus welcomes his widowed daughter-in-law and his three grandchildren from Fort Wayne, IN; neighbor Mrs. Finley wants to chop down the Witherspoons' tree; Jessie finds a job; Kris is unhappy with the curriculum at her new school; everyone adjusts to the new household.
Gus's old Marine buddy J.J. Moon visits, and his overbearing personality wears on the family; Gus enlists a reluctant Molly in the battle against a gopher; David subcontracts his home chores while working for Mrs. Taft.
Inspired by the stories of Gus and his pals, David and J.R. decide to pull a Halloween prank aided by Kris; Molly is exposed to chicken pox; Gus wants to make the kids first Halloween with him special.
Joe Kaplan bets Gus that he can't keep from interfering in the lives of Jessie and the kids; David searches for a way to deal with bullies at school; Kris is hurt and angry when a favorite teacher jeopardizes her dream of attending the Air Force Academy.
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.