first of all, as a husband, you, because all your property is owned by your wife, you should let your wife guide you in fairness when you give money to your parents. To put it upside down, if your wife sticks up two credit cards in her family and lets her parents invest, I believe you won't feel better if you don't discuss it with her. As for whether it's legal to make an agreement? This is legal, because this is his money and everyone's son's money, and you don't say whether it is reasonable or not? This is unreasonable, because both husband and wife have the right to consult and control the same property, but parents do not have this right.