i Need to Vent!

We decided not to include kids in the wedding, aside from my kids and the flower girl. We have a limited seating at the wedding-unfortunately kids counted, and we wanted to invite as many people as we can. My FH has 5 sisters, 2 of which are step sisters, but they all love each other (which is wonderful). One of his stepsisters has 2 boys....mind you he loves her and her boys, but he's not close with them, nor is she with him...which is fine, there's absolutely no animosity between them at all. We got backlash from his dad and biological sisters because we didn't make an exception for them to go to the wedding. We were told that she was probably really hurt by that, how could you do that, those are your nephews, that's your SIL (I've only met her twice, I'm not close with her either). All in the while, she's made no attempt to find a baby sitter or even ask her husband to watch the boys because she wants to be there for her brother. Also, when she got married (which was years ago), my FH, nor his biological sisters were invited at all. Also, I've had to tell my own family members they couldn't bring their kids, and they made arrangements without complaining (that I know of)...she's not the only one! On top of that, NO ONE has offered to help pay for this wedding and it's expensive!!! If they did, that'll be a different story. We had a discussion with her at the beginning as to why kids weren't included and she understood, and immediately opted not to go without even attempting to compromise. Yet, we still received backlash because of it. His sisters and dad live in different areas, so I can understand wanting to all be together since it's rare, but this is still my FH and my wedding, not a family reunion. She could have made some effort to go. Am I wrong for feeling annoyed and frustrated??? Plus on his mom's end, we are continuously being asked if space opened up to invite someone we never had intentions of inviting....this has become ssssooooooo frustrating... If I'm wrong please let me know!