NO. Unbelievably NO.
Farmerboy, I read your posts about your self-image after your abuse - it was heartbreaking even in the midst of how good it was to see other people try to reassure you and pick you up.
But there is another potential victim at risk. And as much as you may hate yourself in dark moments - how will you feel if it happens to another kid??
I hate to push - I hate to poke at someone who is hurting, when no one helped you - but you are the only one who can stop this. Confront your brother. Explicitly.
And record the conversation.
"Don't think it hasn't been a little slice of Heaven just because it hasn't!" --Bugs Bunny