When did Mom Season 4 Episode 21 air?
Mom Season 4 Episode 21 aired on May 4, 2017.


Aan irreverent and outrageous take on true family love‐and dysfunction. Newly sober single mom Christy struggles to raise two children in a world full of temptations and pitfalls. Testing her sobriety is her formerly estranged mother, now back in Christy's life and eager to share passive-aggressive insights into her daughter's many mistakes.

Christy and Jill take Emily to see her biological mother, Natasha, in rehab where they make a surprising discovery, and Bonnie watches Adam’s dog while he’s out of town.
Direct answers for episode-level questions and details.
Mom Season 4 Episode 21 aired on May 4, 2017.
This episode runs for approximately 23 minutes.
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