I work in the community and am a single mum with no local relatives to help me out on school closures, so have had to take my 9yo on a few home visits with clients. I have always been very careful to keep my home life separate, but have a "difficult" elderly man who has been persistent and kept "popping in" to my office. I had a word with my manager and moved offices (he doesn't know where!) and I thought everything was good- BUT
A few months ago, the same client went up to my 9yo child outside school (child was on his own by the gate with friends as I'd dropped him off and gone to work) and actually asked my child for our address. 
I only realized this when he turned up later on unannounced.
I was devastated to lose my privacy, but my child didn't see it as stranger danger because he'd visited the client's house with me. I've seen this man walking near my house a lot since then as if he's trying to bump into me.
Obviously I need to impress upon my child not to feel pressurized to give information away in future. Am I being unfair to be really angry about this intrusion into my private life or just over reacting?