My bro in law met some fella at a car boot sale last summer, anyway every week they would meet up and chat at the same boot sale as I think this guy was lonely and just wanted someone to chat too.
Anyway after about a month he started taking my bro in law and his wife their 4 year old daughter out for meals etc...
The strange thing is they don't know anything about him except his first name and car he drives they don't know where he works, where he lives, his last name or anything and when they ask he just says I don't want to tell you. however he has been to their house and at Xmas he spent a fortune on them and showed up with a bin bag full of toys for their daughter.
I think this is a bit dangerous as they know nothing and he knows everything about them.