How do comfort your fiance when his family stole money from him?

So my fiance's sister sued him for the value of different properties left behind to both of them by their late mother. She won half the value but she should gotten less than half because my fiance has put 60,000 into the upkeep and taxes for these properties. She hasn't done anything but get arrested and do drugs. His lawyer sucked and didn't even put up a good fight. Hes feels like she stole from him. Hes really upset about it. How do I cheer him up. I told him to cut her out of his life like cancer. Hes really upset he lost so much money. It's even more awful that a drug addicted criminal won ......hes a good guy. It's not fair. I really hate this spoiled bitch!