and stop. The contribution of both to the family budget should be 50%. If he earns two (three, four, and so on) times more, the rest is his personal money. And if he buys an apartment on them, it is his apartment and his wife has no right to that apartment except to live as long as he allows.

Again it is relative. In this case, you need to divide not only the money, but also the labor costs in half. Here’s a list of things that usually need to be shared:
cleaning, cooking, dishwashing, washing, smoothing, small repairs, payment of bills (not in financial terms), purchase of products, calling for necessary services for home service, drawing up a schedule of major cases, administering activities (Dr. Ng...) A separate article is the maintenance and upbringing of the child (it is even possible to set up a separate account for his needs).