Mom initially shows Christy and Bonnie Plunkett’s journeys as they try to stay sober and turn their lives around and the ending answered questions like, “who does Christy end up with in Mom?” Things were not easy between the rocky relationship between Christy and her mom or with her complicated dynamic with Violet, Roscoe, Baxter, and Candace. However, somewhere along the way, Mom stopped focusing on Bonnie (Allison Janney) and Christy (Anna Faris) with their familial issues at the forefront and broadened the spectrum to introduce Marjorie, Jill, and Wendy, three other recovering people with alcoholism who join their meetings.

https://screenrant.com/mom-main-characters-ending-best-worst/