When DS was a year old I left his biological father because of emotional/verbal (and on 2 occasions, physical)abuse. Felt really proud of myself for giving my son a much better life, and 6 months later I met a lovely man who is now my DH and father of DS2.
I have tried to mention the biological family (still in touch with MIL, father has had nothing to do with him- his choice) and don't want it to be a 'surprise' that he has bio-dad elsewhere. DH says I am creating problems by mentioning it if DS doesn't talk about it and that I need to be careful as when DS is 14 he might blame me. AIBU to expect him to accept that I took him away for a good reason (without EVER saying your real father did X, obviously)DS and DH not exactly close, but it is as close to a biological relationship as you could get, and he does think of him as his son.