In spite of an extremely difficult childhood, it sounds like you have managed to create a good home, and produce good kids - you are one heck of a woman. Give yourself more credit.
Sometimes forgetting is the only way we have to cope, and that's OK. But perhaps it's not always the best way. I would seek out someone to talk to with whom you could work through these feelings. That way you'll grow stronger than you already are (which sounds very strong to start with).
Your bio family is not you . . . they never were and they never will be. Ideally they nurture and protect you so that you can grow into a strong, capable individual unto yourself. Since your family couldn't or wouldn't do that, you went on anyway (thank God). You learned how to do better. God bless you for that.
Hang in there - lots of virtual hugs coming your way.
PS: Your post is yet another reason why I detest Facebook . . .
PSS: I loved Regina's answer.