AITA for refusing to look after my SIL's kids cause her husband (my brother) is abusive and I don't want to be complicit?

My brother and his wife (SIL) are coming to visit our city Christmas and they want us to host them for a few days.<br><br>The problem is my brother is a fuck boy, always has been, who constantly cheats on and beats SIL and gets drunk and high and does god knows what while they're trying to raise 3 kids.<br><br>SIL knows all of this and for whatever reason always stays with him. They live far away from our parents so she doesn't really get any support from them either.<br><br>SIL wants me to look after her kids while she and my brother go out drinking on their own for a night. I said no, I won't help her enable whatever the fuck they're going to do and I don't want to be complicit in whatever it is my brother is doing.<br><br>SIL has gone dead silent and now my brother is calling/texting me yelling at me for not supporting his "family" and making this harder for them when it's the goddamn holidays.<br><br>AITA?