My 11 year old cousin molested my 4 year old

I informed my mom and didn’t bother telling my cousins parents because they’re the type of parents that think their kids are perfect and do no wrong and they’ll just turn it around on me. Anyways I told my mom and then I started keeping my child away from their house. My mom still goes there every day and always tries to make me bring my son there. She also continued hanging out with my uncle that molested me as a child. Do I have a right to be mad. I want to cut her out of my life