My stepmom is like yours and she's a  lazy drunk. Wont even cook a meal anymore. My dad has a career. She just popped out kids. Lots. She wears a pad all the time now because she has no control down there. Only 1 kid is my dads. All the rest were before him. 3 mens kids. 5 total.   As for cutting her out. I have done the same in the past. Shes a horrible person.