My two sisters both live across the country and even though one of them is the matron of honor, neither is flying in for my Bachelorette party. My best friend, who is a bridesmaid, began planning the Bachelorette party. My future sister-in-law, who’s in the wedding party as well and whom I’m not very close with yet, was very hurt when she found out my best friend was planning the party. My future sister-in-law is 28, and she’s not very nice to begin with but we haven’t had any issues between us before. She knows my best friend, but instead went to my fiancé’s parents to complain about it. My future mother-in-law and father-in-law then spoke to my fiancé about my Bachelorette party. My fiancé has told me his sister wants to become best friends with me, but she has done nothing to build a relationship with me. How do I handle this situation without offending my in-laws and without making my best friend feel bad for throwing the party?