Dear Prudence,
My brother and I have not spoken to each other or had any contact for nearly 30 years. A few months ago, my oldest daughter sought him out in the hopes of arranging a reconciliation ahead of my birthday. He rejected that idea but invited her to dinner, and they ended up having an intimate relationship, which lasted for several weeks. They’re both adults, but I’m sickened by the fact that they’re so closely related, disappointed in my daughter’s choices, concerned that my brother was most likely motivated by a desire to hurt me (there’s history), and at a loss as to how to react. I have no intention of engaging with my brother, but I’m uncertain as to how or even whether to communicate these feelings to my daughter. What do I say? Should I say anything?
—My Daughter Had an Affair With My Estranged Brother