Margaret is the mother of Finn, Jake and Jermaine. She appears in “Memories of Boom Boom Mountain” in which Mountain Man asks Finn if he can stop the marauders rough-housing and Finn flashbacks on him doing a boom boom on a leaf, lying there for a day without help and being found by Margaret, who considers him an extremely cute baby. Unlike Joshua, she does not appear in “Crystals Have Power”. It is unknown whether Margaret is dead or alive, though she is probably dead. In “Conquest of Cuteness” Finn remarks that Margaret always knew what to do when he or Jake were in a crisis.

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