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Mrs. Selsam is a character who appeared in Double Down. She is the mother of Maddox Selsam. She is probably either wealthy or gives in to any LEGO purchase her son Maddox wants, because either way, she buys her son any LEGO sets that he wants, and her son owns many expensive LEGO sets.
- Diary of a Wimpy Kid: Double Down (First and only appearance)