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Gregg disrupts David's train of thought just when he is on the verge of cracking the most famous unsolved math problem, so the family teams up to get him back on track.
When Jenny's mom invites the Langers to dinner, David claims that the others are out of town so he can go by himself, which backfires spectacularly.
In the season finale, everyone's resentments and grudges come to a head as the Langer Passover celebration devolves into a brutal, high-stakes competition.