Well in my experience it makes no difference how tactful you are. If people are glad to know they have relatives out there they get in touch. If they aren't or think it's a scam they don't. No wayof predicting. Just go for it sending a skeleton tree or a bit of background where the lines unite and hope for the best. I've waited 2 years for a reply in one instance but got a nice letter and photos after I'd gven up hope, but had no response at all on what I'd expected to be dead certs. Good luck, you'll be no worse off if you hear nothing and lots to gain. Sadly you often know more than the people you contact, but sometimes there are gems and photos. Best wishes, Mary