When two people you love are in conflict—don’t’ get caught in the triangle.
Say, a child tells their biological parent something negative about the parent’s spouse—the stepparent. Listen and acknowledge the child’s feelings but avoid resolving the problem. That might inadvertently create an unhealthy alliance against your spouse and don’t speak up for your spouse or that might minimize the child’s feelings. Either way you’re stuck in the middle and they haven't figured it out yet. Listen, validate, and then say: “Let’s talk about how you two can work this out.”