An alternative to the title "step-child," which is a child of a step-parent who assumed the parental role through marriage to one of the child's original (usually biological) parents. Most commonly, the step-parent is the second spouse of one of the child's biological parents. My bonus children come to visit their father and me every other weekend.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.