It's Yom Kippur, and there is much pressure within the Strange family for everyone to reconcile, especially Erica and Sam, but also Gary and Barb, the latter who has has always resented her husband's decision to be a rabbi, and Erica and Barb. Dr. Tom sends Erica back to Yom Kippur 1997 - the year following Leo's death - when Gary and Barb were having a fight over his spending so much time at the synagogue, with Erica siding with her father. In addition to Barb wanting a divorce following that incident, Erica and Barb's relationship has since been an antagonistic one. Erica vows this time to stay neutral in her parents' argument. Although she starts off being neutral, Erica learns more behind her parents' marital woes, which may change her attitude towards both. Dr. Tom tries to provide further insight by sending Erica even further back to 1974, to a hippie commune retreat that Gary and Barb went to shortly after they got married.
—Huggo