AITA for not helping my brother with emergency childcare for his homophobic children?

I (29F) am a lesbian. I’ve been out to my family since I was a teenager, including to my brother, who is roughly a decade older than me.

My brother and his wife have a son (14) and a daughter (12).

My brother and I weren’t super close growing up because of the age difference, but we had a healthy relationship. However, our relationship effectively ended when he married his wife, who is a massive homophobe. One of those holier-than-thou suburban types – think lots of iced coffee in a Stanley cup plus a giant cross necklace. Unsurprisingly, the wife and my butch ass did NOT get along, and whilst I was invited to the wedding, him marrying her functionally reduced our relationship to ‘friendly at family events, no further contact’.

When they had kids, she stayed home, and the kids 100% took on her political views. The boy especially is HORRID. He’s got unchecked access to the internet, seems to have fallen down that entire manosphere-rabbithole, and has said AWFUL stuff to my girlfriend and me. Slurs, ‘this shouldn’t be legal’, the full shebang. The girl’s more quiet about it, but I can feel her stare daggers into me whenever I kiss my girlfriend on the cheek, and she once asked me flat-out whether I was ‘allowed’ to be in a women’s bathroom because I have short hair. I only see my brother roughly twice a year (family Christmas/birthdays, where we’re politely distant) and his kids even less than that, but they’ve managed to cram in SO MUCH VITRIOL into these few (and short!) meetings.

Last year, my brother’s wife started experiencing major health issues. She’s probably going to make it, but their entire life has been taken over by medical appointments. To his credit, my brother appears to have stepped up to caring for her pretty well. However, he also needs to keep working, and he’s 100% overwhelmed. Our parents are experiencing health issues of their own and cannot take on the kids. Other friends seem to have disappeared into thin air.

He’s begged me to help – specifically, to take the kids for a week this August so his wife can receive surgery. I told him flat-out I couldn’t. The kids would have to live with my girlfriend and me. My girlfriend is shorter than the boy is these days, and last time she met him, he called her a slur. Even beyond safety concerns, these kids have been nothing but horrible to me and her. My brother swears they would ‘behave’, but I seriously don’t want these kids in my house. I know this is is a terrible situation for them (their mother might die! seeing her in her post-surgery state might honestly be traumatic!) and they are children who aren’t at fault for how they were raised, but that doesn’t change the fact that the boy is the size of a grown man and honestly vitriolic.

AITA for refusing?