Mom - Season 4 (2016)

Christy and Bonnie think Roscoe has a drug problem when Baxter and Candace catch him smoking pot.

Violet is sick. Christy and Bonnie are rushing to her only to find out that having mono is the least of her problems.

Christy keeps a constant eye on Roscoe when she learns he's been using drugs and alcohol.

Christy and Bonnie worry about Jill when she cries for help on the anniversary of her mother's suicide.

Christy and Bonnie resume illegal activities, leading Adam to question their morality.

Christy and Bonnie have their hands full when Adam's hard-partying friends come to visit.

Bonnie and the ladies keep Jill's pregnancy a secret, causing Christy to feel left out.

Bonnie encourages Christy to pursue Marjorie's charming nephew Nick, despite the fact that he's been declared off limits.

Christy, Bonnie, Jill and Wendy get high after accidentally eating cookies filled with marijuana.

Christy worries that Bonnie is jeopardizing her relationship with Adam when Bonnie connects with a handsome stranger.

Bonnie drives everyone crazy after breaking up with Adam, so Christy tries to get them back together.

When Bonnie discovers that Adam is still close with his ex-wife, Danielle, Christy worries the emotional fallout could jeopardize Bonnie's sobriety.

When Christy and Adam get into a car accident, Bonnie is hurt to discover she is neither of their emergency contacts. Wendie Malick returns as Adam's ex-wife, Danielle.

Christy helps Jill adjust to being a foster mother; Bonnie tries to convince tenants she's a good building manager.

After Bonnie's mother dies, Bonnie and Christy discover a big secret she kept.

Christy adopts her new boyfriend's healthy lifestyle, while Bonnie and Adam take their relationship to the next level.

When Marjorie takes a break from the group, Bonnie becomes the go-to for everyone's problems, and Christy tries to overcome a painful memory from her past.

Christy and Jill take Emily to see her biological mother, Natasha, in rehab where they make a surprising discovery. Meanwhile, Bonnie watches Adam's dog while he's out of town.

On the fourth season finale, Christy tries to help when Bonnie gets into trouble with the IRS. Realizing she's in over her head, she encourages Bonnie so seek help from her newfound brother, Ray.