Just like Fan in the TV series we watched, she has worked hard in Shanghai for so many years, and there is no money left. All the money she earned was given to her brothers to buy a house and a car, pay off their mortgage and raise their children. In fact, there are still many such girls in real life. I think most men don't want to find this woman as a wife, because it's not just her who gets married, but her whole family.
As her husband, I will definitely control her expenses at home, because we are also a small family, and the money we earn needs to be given to ourselves and our children. We can help them properly when they are in trouble, but we can't bear everything, because everyone should be independent and my brother should have a sense of responsibility for his family. If we continue to spend money on him, he will never grow up.
But it ultimately depends on your wife's attitude. If your wife is tired of this kind of life, you must support her and let her gradually move away from this family, but only if you give her enough sense of security. However, if the wife also takes this for granted, then I think you can consider the relationship between the two of you as soon as possible, because if you meet a younger brother who doesn't work hard and spends money indiscriminately, it may be a bottomless pit, which will not only drag down your wife, but also drag down your whole family.
So you must communicate with your wife carefully and explain all the consequences to him. I think if he really loves you and your family, he will definitely consider these things. He will slowly control his brother's expenses and won't give all his money to him.