Compared to other parents, remarried parents seem more desirous of their child's approval, more alert to the child's emotional state, and more sensitive in their parent-child relations. Perhaps this is the result of heightened empathy for the child's suffering, perhaps it is a guilt reaction; in either case, it gives the child a potent weapon--the power to disrupt the new household and come between parent and the new spouse.

Family politics: love and power on an intimate frontier (ed. McGraw-Hill Companies, 1983)