In 1964, John-Boy Walton is planning his wedding to Janet Gilchrist, the editor of a New York fashion magazine and the daughter of a diplomat. The two of them plan a small wedding and he invites the family and friends from Walton's Mountain to come to New York for the celebration. However, Janet's Aunt Flo has other ideas and begins to take over their wedding preparations. Added to the wedding plan stress, John-Boy is also trying to write an article about his Grandma, but decides that he needs to go home to escape the wedding preparations, as well as to reunite with his grandmother and fill in some gaps leaving Janet in New York trying to prevent her wedding from getting out of hand. But she too leaves the city and heads for Walton's Mountain to plan their wedding there.

Most of the Waltons have split up in the days approaching Thanksgiving 1947. But most of the family begins to arrive at Walton's Mountain begging with John-Boy recovering from a case of writers block in New York followed by Jason now a struggling musician as well as John Walton whom tries to get everyone together for the special event for Elizabeth, while newlyweds Erin and Paul plan to move out of the Walton homestead.

In 1969, John-Boy is a TV news anchorperson in New York and he is in the throes of writing a new book. He and a very pregnant Janet are making plans to return to Walton's Mountain for the celebration of John and Olivia's 40th wedding anniversary. Accompanying them to see the place John-Boy lived as a child is Aurora, a Time magazine photographer, who is doing a story on John-Boy. Meanwhile, Elizabeth arrives back from her travels and announces to Drew, who is still working at the mill with Ben, that she is back to stay. She is very upset to find that Drew did not wait for her, and that he has a new girlfriend. Also, problems arise for John-Boy and Janet because the longer John-Boy stays on the mountain, the more he becomes convinced that he would like to settle down there, raise his family, and continue with his writing whereas Janet wants to stay in New York.

Mary Ellen marries Jonesy but they don't exactly have a good start.

The fourth Waltons reunion TV movie is set in the 1960s , with John-Boy still living in New York, trying to persuade his fiancée to marry him. Meanwhile, Ben and Cindy's daughter Virginia has died, and Cindy is finding life very lonely without her. She tells Ben that she would dearly love to adopt another baby, but Ben feels that it is not a good idea. Ben argues with his father about buying a new truck for their lumber company, but John keeps insisting that they can't afford it. Elsewhere, Erin now has three children and is separated from Paul. Her decision to start seeing another man causes some indignation among the other Walton family members. Ike and Corabeth become grandparents when Aimee has a daughter, while Elizabeth returns from Europe and reunites with Drew, her old beau.

Erin Walton is considering marrying her boyfriend Paul but her old boyfriend Ashley, who left for the war and married someone else, lived through his wife's death and would like to get Erin back, but Paul is not going to give her up so easily. Also Mary Ellen's boyfriend Jonesy who's a veterinarian is trying to establish a practice but everybody doesn't think he is competent. And Ben who has been minding the lumber business while their father's with their ailing mother in Arizona is having some problems and everybody's worried that he's digging himself a hole that he might not get out of.