Sexual Abuse Healing

So this is strange for me, as it's been 16 years since the one-time occurrence, and I've never told anyone what happened to me.  When I was 8, I was molested (one time) by my brother (who was 16).  Basically, he said "I heard some girls like this" and 'fingered' me... For a time I though maybe he was curious or didn't understand, but later in life I learned he lost his virginity at 13 - he knew.  Then I thought, since it's been so long, maybe it was a dream, it didn't actually happen - but I remember every though it my head as it happened, and at 8 years old I was not really aware of my parts down there, so why would I dream something like that?

Anyways, aside from whatever long-lasting issues this may have left me with (I can't orgasm, and don't enjoy sex), I've moved past the incident and my large family seems to get along fine now, and I never wanted to disrupt that dynamic or cause my parents any pain.  The issue has come up again now that I learned my brother's wife is pregnant with a baby girl.  I worry so much that she'd be in danger, as he's always been a sexual deviant (when he was 20, his girlfriend was 14 - they were together for 6 years.  When they broke up, he began dating 18 and 19 year olds, and married a woman who is closer to his age but looks very young).  I know it may be different since it's his daughter, but i was his baby SISTER and that didn't make a difference.  I don't know what to do - on one hand, I would certainly destroy my family and a lot of lives by telling anyone, but on the other I risk the future of an innocent child.  What should I do?

Thank you for your response.  I guess I didn't realize how much this affected me - it's different knowing someone else out there knows what happened.  I've been in therapy and was never even able to tell my therapist. 

This is a hard decision because I don't feel like I would get any closure or resolve any issues by telling my family what happened to me.  I suppose that's something I would need to talk about in therapy - but I just don't see anything positive coming out of it. I guess I'd like to hear how telling people has been a positive experience for others in this situation, because in my mind I'd rather carry the burden and have just myself affected by this than drag my entire family, my brother's wife, and her family down with me.  Also, if I alienated myself from the family by confessing this, then who would be there to protect or watch out for my niece if/when the time comes?

It is so hard to decide what is right. Have you thought about confronting your brother about the situation? I can see your cause for concern. I am going threw something similar and about to post my story. I will let you know how my situation pans out.