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Madelaine Lam describes her 6-year-old son as studious but not nerdy, and she wanted his bedroom to suit him.
Ms. Lam and her family moved into their five-bedroom, 6½-bathroom home in University Park, Texas, in 2013. When Preston turned 5, she got serious about redecorating his room, a roughly 180-square-foot suite that includes a bathroom and…