Watch Mom Season 4 Episode 21 online via TV Fanatic with over 8 options to watch the Mom S4E21 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, Hulu Plus, Verizon On Demand, and Paramount Network.
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On Mom Season 4 Episode 21, Christy and Jill make a surprising discovery when they take Emily to see her biological mother, Natasha, in rehab.