Hi and Welcome,
I'm glad you're taking care of yourself.
You likely won't be able to convince your dad that he is enabling your mother. That is something he will need to realize himself.
There is lots of support here and I hope you continue to read and post.
Our deepest fear is not that we are inadequate. Our deepest fear is that we are powerful beyond measure. It is our light, not our darkness that most frightens us.