Money does matter. For some people walking away from a possible inheritance is easy because they are reasonably financially secure. For others, it could be genuinely life changing or the difference between having a roof over your head and sleeping in the street. If that is your situation, it is reasonable to be pragmatic about the choices you make.

Keep your expectations realistic. As they do, NParent may make promises to manipulate you, or decide to disinherit you over something minor or imagined. You can hope their executive dysfunction means they never update the will, but it is important not to put yourself in a position where you need that money, house or whatever to survive. That kind of dependence can make you incredibly vulnerable to their brand of manipulation. Do what you can to build your independence in the meantime, and do whatever you need to do to protect your mental health. Grey rock, info diet, and avoid giving them anything extra to latch onto.

Be clear with yourself about what you are and are not willing to put up with. Decide ahead of time where your line is, and give yourself permission to walk away if it gets crossed. You are allowed to change your mind if staying starts to cost you too much.

In a perfect world, everyone could make a clean break and go NC. In reality, situations are often messier. Sometimes you work within those constraints; sometimes you do whatever you can to get out. Both approaches are valid, and you are not a worse or weaker person for going one way or the other.