The first thing that my parents told me after hearing about the sexual abuse I suffered was that I mustn't ever tell anyone about it. This led me into a lot of silence and then a lot of explosive disclosure later. I have found over time that it is hard to keep consciously quiet or consciously vocal; neither seemed to work for me, at least neither seemed to render support.
I have a bad habit of saying things that take some kind of research to decode, which I'm not necessarily advocating, this is just how it's been for me. Sometimes it comes up in a situation that I had PTSD, like when it's dark and I'm walking with some people and jump or hit the deck at hearing a loud noise, and I explain my wacky behavior by saying, "I have PTSD," which usually prompts, "You do?" to which I generally explain that I was a vet. From the Revolutionary War. Or some such stinking BS (I sincerely apologize if this sardonic comment bothers any vets here. Anyone who knows me from a tree knows I'm not a vet, and it's easier than saying, "Yeah, well, continuous sexual abuse is a b*tch. Hah! Am I right?"). Those who know anything about the disorder or care enough to look into it generally come to me at some point to ask why I really have PTSD, at which point I ask if they know anything about PTSD that is non-vet related, and depending on their answer I either tell them what has happened in the detail I feel comfortable with or I ask what their deductions are and fill in the blanks as necessary/comfortable.
It sounds really roundabout, and depends on the reactions of those around you, and it's not exactly what I would describe as 'discloure,' but it's something that's been working for me. These individuals that follow up on my flippancy are usually those from whom I receive the best reaction, who render validation instead of questions and sympathy rather than shock. I guess what I'm saying is, maybe there is a way to somehow screen those who you are contemplating telling before you decide to definitely do so. For me, I haven't talked much to my more distant relatives, even those I have a relationship with, because I know that my parents (while telling me to be quiet) spread their own story of my experience through the collective family mind, and I don't want to talk to people who are pretending they don't know what they do know.
I hope I said something of use in all that.