My grandparents keep defending him

I've cut contact now, but I'm mad about this. My brother sexually assaulted me multiple times, and they know this. They still would invite him to the same family gatherings as me and lie and say that he wouldn't be there and say I'm being ridiculous and need to move on. They insist they just want us to be a family again and they're not taking sides but my sister/cousin thinks it's obvious they are and my other brother says that in this situation not taking sides IS taking a side.

I'm just so mad about it.