I told a close friend, and then my nieces. I felt I needed to tell my nieces because their mother, who died of an overdose in 2010 had also been abused by my brother. I thought it would bring them some sense of closure about their mom. Also, my brother is still out there and makes noises like he might visit them one day, and I wanted them to know that he is a predator. It helped me a great deal to break the silence, but then I have no other family left to tell beyond those nieces. I am slowly enlarging the circle of people who know about my past. I don't care what people think at all, but do not want to make it "all about me", so I am choosing carefully. I feel that the more people who know, the better, honestly. Good luck. If you feel the need to tell those folks, then it is probably the right thing to do.
Freeman