with sister is easy block and move, there is no obligation whatever, plus serious if you was really close or she would ahve trained you well or you would.
mothers are a little more troublesome since if she was there for you, you will some kinda of loyalty toward her, but even so, best you can do is train her, best of all is you can fight with her and say your mind without care, if she never talks with you again its a win for you, if not she will start to behave, what I do is simple, everytime she plays the victim card I dismiss it with yeah you have such a hard life, retired with the whole time in the world to do whatever, it is really hard,, or tease her with being slow, and don't care for what she does, one time she was doing something annoying to me, I told her to stop, she start the drama of she can't do anything. I just told her you can do whatever you want as long it don't piss me off, problem solved after.
understand this woman, will need guidance like a child don't matter how old she is or how much she have her sh!t together, also don't trust any woman says she doesn't, she is just lying to make herself feel better, you know the whole girl power thing