Do I have to give money to my mother when I only work part-time?

Assalamu alaikum, I’m the eldest son in a family of six. We barely get by, just managing the bills. My father works nonstop, I hardly see him, and my mother chooses not to work. I work part-time but pick up as much overtime as I can to save for my future, alhamdulillah. I have my own expenses too. But now, the more I earn, the more my mother demands. If I don’t pay, she threatens to kick me out or block me from using things at home. Last month I made $1,000, and she suddenly asked for $400-almost half. Before, when I earned less, she took less. I had already set aside $200 for her, but she screamed that I must give $400 just because I earned more, without any warning. I ended up with next to nothing for the month. She says it’s for bills, but then she restricts me from using electricity. She yells over small things without explaining, like a cup left out for a few minutes. I’ve dealt with this harshness for years, but now it’s about money since I’m earning a bit more, and I just want to save for my future. Is it my duty in Islam to give her so much?