My NEET brother refuse to work and is draining my father’s money.

My older brother, my grandmother, my father and I live in the same household. My father died suddenly one night, we weren’t prepared for his departure. I work and make enough money to live by myself and pay for the house bills, however my brother (33yo) doesn’t work nor studies, he has never had a real job in his life and every time he tries to get one no one hires him. He is obese, and really doesn’t care about his health, every time I mention him his condition and that he might die in his 40 he just gets defensive and says that he is eager to die. He is a manchild, no one can say anything to him because he starts a tantrum. The worst part is that he has an obsession with a girl with 2 children, he wakes up early daily to get her to work, and bring her back to her home later, basically her personal driver, and he pays for everything, gas and any thing the girl wants to eat that day. The girl doesn’t even pay him a kiss, she is using him and he is falling for it. When my father was alive, my father blocked all access to money and cars to my brother, now that he is gone, my brother is using recklessly all my father’s assets. I want to use a portion of my father’s money to invest and have an emergency fund, but my brother is slowly draining that money. I told him to at least 1 year of reduce his expenses, but 3 days after my father passed he went to the movie theater with that girl and her 2 children, my brother payed for everything!! I don’t know what to do, I guess the obvious action is to block all access to my father’s money, but I’m afraid he will get depressed or seek others way to get money (he used to steal money from my father). I don’t like to say this, but he is a drag for me, it’s making a lot harder to deal with my father’s death.