But mothers and daughters aren't always best friends. Storm clouds in the adult mother-daughter relationship most often arise over one very basic question, says Laura Tracy, Ph.D., a family therapist who specializes in counseling mother-daughter pairs and has written books on the relationships between women. "Will the mother accept the daughter as an adult? That means, when she's visiting you, does she let you run your house? Does she trust you to be independent on small issues as well as large — who are you with, what's your sexuality, where do you work, how do you spend your money? Letting the daughter be her own woman is a universal issue," she explains.