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1. Brother-in-law should not let your wife pay for a house. If two people don't have families, it's definitely different. If your sister earns more money, you can give your brother more pocket money, but no matter how close your brothers and sisters are, they will eventually have their own families and children. Your wife has married you and set up her own family, and your wife's brother has become a brother-in-law. More should be made for your own home. Considering that you also need materials to run a good family, so that the family will be happier and have more quality. If your brother-in-law is short of money and you have enough spare money, you can help your brother-in-law, but you can't help your brother-in-law completely with a sum of money. On the one hand, buying a house is not a small amount, on the other hand, it will hurt your brother-in-law and make you.
Second, you can't be Voldemort in the past. The biggest and most unacceptable opinion is the man. You are not married, so to speak. As long as you earn money, you can spend it on your younger brother, but after you get married and have a husband, you can't be Voldemort wholeheartedly, because it will make the man very worried and feel that his wife only cares about giving money to his younger brother, not the sisters who help his younger brother with family construction. The younger brothers may not remember their sister's kindness, and they will feel that they are worthy and worthy of her help. So, don't be a demon, don't be an unbearable bucket.
Third, your wife's money is your common property. Your brother-in-law wants your wife to buy a house. Your wife must discuss it well with you, because after you form a family together, their money is the common marital property, not hidden from each other, or spent quietly, or given to relatives. This will not only make you quarrel about it, but also make you quarrel.