For decades, the cinematic blended family was a landscape of inherent villainy and inevitable tragedy. From the frosty cruelty of Cinderella’s stepmother to the near-comic neglect in The Parent Trap , the unspoken rule was clear: a family built by choice, not by blood, is a fragile, often dangerous, institution. The stepparent was a usurper, the stepsibling a rival, and the child a pawn in a war of loyalty.