What kind of standards of conduct and behavior should parents impose upon an adult child living in their home? Our single 29-year-old daughter lives with us in separate quarters off of the main house. She knows how deeply we feel about marriage as the only appropriate context for sexual expression, but she’s made a habit of having her boyfriend sleep over on a regular basis. I know I can’t force her to change her behavior, and I don’t want to lose the influence we have with her or hurt our relationship by making this an issue. But it does bother and concern us. What should we do?