I realize my backstory may be a little difficult to follow, but I need advice so here goes. My fiancé John's half-sister, Anna is married to my sister, Karen. I met John when he moved to the city to build a relationship with his father, who left when he was 2. Fast forward 4 years, John and Anna HATE each other, the relationship with his father never grew into anything, and they do not speak to each other. Needless to say, this has put a strain on the relationship between me and my sister Karen. Karen supports her wife and barely speaks to me. This has made my wedding planning very difficult. I want to include my sister in my wedding activities. I have plans that include my fiancé's other sisters and my other sisters and the problem is, I do not want to invite Anna. She is a woman, but I don't want her to be with us on "Sister's Day" when we go dress shopping and have a spa day. She and I aren't close, nor do I want her around. My sister wants her to be involved because technically she is one of the "sisters," but my fiancé doesn't even want her to be at the wedding. I'm sure my wedding will decide whether or not Karen and I will ever have a relationship going forward, but I'm stuck between a rock and a hard place.
One Big Happy Family