My DF is an advanced age. He has recently confided to me that my stepsister tried to seduce him years ago (she was an adult ofc) He never told anyone including his wife, my stepmother. He does not want anyone to know and has asked me not to tell anyone, The reason he told me is because he thinks she is trying to get him put in a care home so she can move in with her mother, He doesn’t trust her. WWYD?
YABU - you must l tell the rest of the family
YANBU - respect his wishes and keep quiet