I am going to be first time mom and I am having a really hard time with my SIL. She has a son of her own from a previous relationship, and since she's been married to my brother, has had two miscarriages...which I would never wish upon anyone. I can't even imagine how terrible it would be. However, she treats me terribly because I'm pregnant and has made me so uncomfortable to even talk about my pregnancy. She refused to come to our gender reveal party, and is no longer even speaking to me. My brother, her husband, is a very supportive husband and is always on her side. Which I admire and get upset about at the same time.  I am truly at a loss of what to do. I've tried to be supportive, but I also don't want to hide the fact that I'm over the moon excited to be pregnant anymore. It's not fair to me.