DEAR ABBY: We’re a same-sex couple, and my husband has never gotten along with my sister and her husband. The tension has grown over the 17 years they’ve known each other. I suspect my sister may feel competitive or even jealous of our relationship. She comes across as self-focused, while her husband is quiet and disengaged.  We see them once a year for a few days, but my husband now avoids them entirely — he even opts to stay in a hotel during part of their visit. I feel torn: I understand my