So this weekend was my birthday, which was great. I had an awesome time with my FH and my parents took us for dinner on Saturday night. I mentioned to my FH on Sunday (my Bday was Saturday) that his sister didn't say Happy Bday to me on FB; not a big deal as I'm not very active but the rest of his family did. So he decided to text her to see what they were up to, not about wishing me Happy Bday. She goes on about how her youngest daughter has her first communion in April, after looking at the calendar we have it's the same day as my nieces first communion as well. So FH and I decide we each will attend the communions separately. We didn't think it was a big deal, so my FH texted his sister to let her know it would just be him going to his nieces communion. Well that started a fight, because now I apparently don't want to be part of his family. Which isn't true I just want to be there for my nieces as well. His sister kept going saying she didn't wish me Happy Bday because we aren't close and she doesn't see us becoming close. Then said that if I don't attend my FH's niece's first communion she won't attend my bridal shower. I don't see how one relates to the other. I have been putting in effort to get to know his sister better, but I'm just so irritated now that I don't want to keep making the effort if she doesn't want to do the same. I am just at loss of what to do, I'm going to stop trying so hard to get know her I guess.