Talk to a lawyer. But transferring the house to you with an agreement she can stay there till she dies is quite common here. And sidesteps all the inheritance stuff. But you often have to do it x years before she passes.
This is likely to get ugly and I would advise talking to your brother about it once you know what you’re doing so it’s not a big shock after she goes.
I mean it literally is. People post it there voluntarily knowing that. It’s what keeps the lights on.