Need advice

My daughter does not want to be around my sisters. My dad planning a get together because my grandfather sick. I expressed her feelings to my father he says she a child has no options. She doesn't like being around them because they disrespect my wife. I didn't even think she noticed. However expressed me that she doesn't like them because they mean to my daddy (yes she calls her dad she knows she is a girl she picked daddy on her own) I just don't know what to do.