My 18 year old stepson has lived with me and his dad for 5 years, never met real mum, she had an affair and left him with his dad, I met his dad 1 year later and we have lived together for 4 years, whenever he meets his mum he comes back horrible telling me what I should be doing for him, obviously she is feeding him her views on me parenting him, yet she only sees him about 4 times a year, when he wants clothes or money off her , it drives me mad!!!!