Sacred for sister marriage

I m a male from a small village and my elder my sister got married a few years ago it was a love marriage , and now they have a son. Her husband doesn’t work, and we come from a lower-middle-class family. I’m just 26 years old, not financially stable, and not earning well. For the past five years, I have given him all the money I earned, but he keeps asking for more. I can't bear to see my mom cry—it feels terrible, and I don’t know how to deal with it. My biggest fear is that if I stop giving him money, he might hit or leave my sister, which I don’t want to happen. It’s killing me because I have nothing left for myself, and I still can’t bear to see my mom cry. Serious reply only