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I adopted my step daughter when she was 7. She is now 37. It was bio dads idea to avoid child support. Long story for another thread.
The main reason I did it was if mom died bio dad would get custody which would be a disaster for DD. Bio dad already abandoned three kids from his first marriage and later another one from his third marriage. My wife was his second. Plus while not a druggie his lifestyle choices put him first always and when he did have DD it was always on his terms. Rarely did he complete his weekend with DD as something would always come up and he would call and say she is coming back right now-to hell with any plans we might have.
Adoption solved all that and put us in total control. He faded away years ago.
I can’t tell what the motivation is for the OP. If it is to further wall off bio mom as “punishment” then I disagree with the adoption. If it is to provide stability in the event of his death or the chance that bio mom might try to involve herself then that is worth considering.
In any event adoption does not preclude allowing bio mom or her family from involvement on his terms.
I do get the Disney romantic feeling from his posts.
Go for it! Their mother signed away her parental rights. She has no say so any more, even if she sobers up. Nothing wrong with the girls keeping in contact with their mother's family, if they want to.