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#Newlywed’s twin sister is sleeping with brother-in-law

James Woodson, Getty Images

Twin sisters facing each other

Twin sisters facing each other less

Dear Carolyn: I married the man of my dreams, only to return from our honeymoon to find that my twin sister has been secretly sleeping with my now brother-in-law. Problems have since arisen.

First, I’m upset my sister is sleeping with someone I now consider family, and for whom this is essentially just a booty call. (He won’t even let her tell people they are friends, and tells everyone he doesn’t even like her.) She keeps telling me he’ll realize he actually loves her, “one day.”

Second, she now thinks it’s appropriate to spend three to four nights a week at my in-laws’ home and invite herself on outings she wasn’t invited to. My mother-in-law and I have always been on shaky footing, and now I’m fighting jealousy over someone who isn’t even dating into the family! Help! I don’t want to be mad at my sister, but she’s making me crazy! — Twisted Sister