I agree with LeeAnn.

You have documents and, I hope, are not suffering through this abuse alone. Talk to someone who can help you decide how to cope with this. If you believe there are others who may be potential victims, perhaps this should be brought to the family's attention. Show the letters to your doctor, clergyman, therapist, etc. and then decide from there.

The holidays are stressful enough without having to deal with matters such as this one.

I was a vicitm of sexual abuse by an uncle through the years of 7-9. I never told anyone about this until I sought a psychologist when I was in my 20's. I don't recommend that these types of matters be tucked away in the family closet, but you will need to know how to deal with this in a way that is healthy for YOU. I kept mine a secret out of guilt and I don't wish that on anyone.

Good luck, and I really mean that.