If he has abused you and you strongly suspect he may be abusing others then you should follow your heart and do what's right. Families unfortunately tend to ignore/deny these things. They are ugly.
You do have options. My statute of limitations ran out but it is different in every state so you may want to check out your state and see if there is anything legally you can do for his abuse against you.
You can report it to the authorities. Maybe they can't do anything but maybe they can. They can give you advice on what you can do. If they can intervene somehow then at least the abuser and his family will know that it isn't a "dirty little secret" that they can hide anymore. It's worth a try and if some kind of proof turns up then there is already something on file.
I confronted my abuser because he was father. I explained what I remembered and told him that I would be watching him. He is threatend. Then I told all my siblings both with and without children because they need to be aware. My family seems to want to forget but I know that in the back of thier heads they will always know and keep the kids safe.
It's not an easy thing to do and to involve yourself takes guts. It was hard for me but I knew I couldn't live with myself if I found out anything happened to one of the beautiful kids and I had never said anything.
Do what you can and have to do. I wish the strength to make the right desicion and peace.
Heidu