Thank you very much for your advice

Walking away or setting some other consequence for them stepping over the line is a good idea. I actually never thought of the idea of a consequence when they step over the line other than repeating myself. Maybe doing that will finally get through their heads because it seems that simply repeating myself doesn't get through to them.

I agree that if I don't want my sister to call, even for no reason, that she should,'t try and make me feel guilty. I try to set up boundaries with her frequently but she always guilts me into doing things anyway. Maybe I need to be more stern about my boundaries. She thinks that I should jump to help with every little thing that she wants.