Thank you so much for sharing. Congratulations on your wedding!

Im sorry your mum wasn't able to protect either you or your brother. It sounds to me like your brother feels guilt and remorse for exposing you to something he didn't understand either. I hope he does seek therapy for himself as a survivor and also as a perpetrator, everyone would benefit, especially his kids.
Although the road ahead is a rocky one, with your husband's support and the love, strength & compassion you appear to possess I reckon your future looks pretty awesome.

Keep taking care of you.