AITA for telling her if she’s too poor to afford to feed her kids, then they’re too much of a burden for me to raise?

My (30M) brother and his ex-wife have three kids (6F, 4M and 1M). The couple divorced five years ago and I agreed to adopt the eldest two because my brother didn’t earn enough money to provide for more than one child and my parents and I wanted to stop him from constantly shuffling his kids between homes and thus affect the children’s education.<br><br>However, his ex quit her job when the youngest was born, and my brother still couldn’t afford to support three children. So I offered to help by paying for their house and food. My money is in a separate account that my brother has the pin code to.<br><br>Last week, I got a call from his ex asking if I could pay the bill for her food and other expenses for the month because my brother hadn’t been able to pay her yet and she was running low on money. I agreed. However, she then texted me later saying she was too sick to go shopping for food and the kids were getting hungry. She asked if I could not only pay her rent this week, but also pay someone $60 to drive by and drop off food and formula for her and the kids.<br><br>This pissed me off because she has been job hunting for two weeks, so I told the two of them they were too much of a burden on me and I were going to cut ties and turn the kids back in. My brother begged me not to, and his ex kept whining and crying, but I didn’t care. I hung up and decreed that my nephew (6M) was to be sent to me and that my nephews and niece were not to be mentioned around me. My brother has since been knocking on my door to beg me to change my mind, but I’m standing by my decision.<br><br>However, some of our family have called me an asshole for abandoning my nieces and nephews. I’m not sure if I am though.