I have just found out that my DD's friend is actually her boyfriend. They were friends before having met through a mutual friend so although he is a bit older I was fine with the friendship especially as she is mature for her age and he is a nice lad. Now I am confused because she is 15, almost 16 and he is 19. I like him and she is sensible but I am so aware that it is illegal if it develops further. She's always maintained they were just friends for this reason. Any advice would be much appreciated.