In reply to Saldi:
Hi, friend of mine had couple of one night stands with a work colleague. She got pregnant, and told him it was his. Kid was born and he did his part, paid child maintenance, had the kid on weekends, and the kid was involved with his parents. A few people commented the kid was quite dark. The mum and him are white, although he's quite tanned. At first it was kind of mentioned jokingly but eventually people started to have proper doubts. Eventually he got a paternity test and it wasn't his. He was obviously upset and felt foolish but also, I think, a bit relieved. His parents were very upset to and offered/asked to continue seeing the wee guy as the real dad and his family remain unknown, but the mum said no.
Make of that what you will, but if I had any doubts whatsoever I'd have a test.
Also, I think Jim C was genuinely asking what you meant, I wasn't sure until I read further down but there's really no need for the other stuff - e.g. "you have a curious posting history"? what a strange and thoughtless thing to write. Ignore them and I hope you're okay.