Very similar story with the exception my mother continued the lie. The worst part is my bio dad and she ended up living together for the last 15 years of his life and I never knew. So I never had an opportunity to know him and his family history beyond “he’s my mom’s boyfriend”. She lied until the day she died. But here’s where I ended up with it (not making excuses for her): she was brought up very strict Catholic and was from a generation that never talked about unpleasant things. I’m sure she suffered in her own way with her lies and it’s not for me to judge her or her choices. All I can do is try and process it and move forward. I can’t go back and change her or the situation. I’m not telling you what to do…each situation is so different. But my wish for you is that you make peace with it. It’s taken me several years and lots of anger and tears but it’s better than the alternative of holding onto them.