Not sure if this is the right place to ask for help, but I've been contacted recently on Facebook by someone claiming to be a relative (his mother is my half-sister, he says, also that my father was his grandfather). My father has been dead for 35 years and I thought I was his only child from a late marriage. Someone has recently been saving records from my Tree but will not respond to my enquiries as to who he/she is. I'm worried the contact on Facebook is trying to acquire information about my family for suspicious reasons. Does anyone on here have experience of anything similar, and what did they do about it? I tried to make my Tree private but it hasn't taken effect yet. Many thanks for any advice.