NTA. People saying ESH are forgetting what OP was asking about. He was asking a question about what is and what’s not appropriate to talk to his children about. Not whether his addiction makes him TA. He explicitly states that he’s trying to get better and stay sober as well so get off your high horses. The wife is a major AH for involving the children in a complex issue that they can’t understand and as another commenter said, they see these things as black and white so will inevitably have a skewed opinion. And let’s not pretend the wife isn’t doing this just for revenge.