I have the same problem with my sister. First, I'm trying to avoid her when I'm feeling vulnerable. Next, I'm going to avoid any situation where I can't leave when I've had enough. Like, I'll meet her at the mall instead of at one of our homes.

I'm thinking about making up a friend. Then I can always say, "Oh I'm sorry. ____ and are are just doing so much. Let me get back to you."

I tried to be honest with my sister, but she got crazy angry. You can only be honest with reasonable people. But it was worth a try. Now I know better.