If you really wish to speak your mind to her, I would. And perhaps she won't give you money anyways, if you cut her out of your life?

And your brother seems entitled - yes, family does step in and help each other, but just because he's getting divorced, doesn't mean that it's convenient then for you that he live in your home.

You don't owe it to your brother to have him live in your home. He should be able to figure this out on his own, unless he is jobless, money less, and has no other options, then I can see that he may try to lean on family to help out. But if he has a job, an income and money to survive, he can do this on his own.