What is the ruling on compensating a son who built upon his father's land, then the father sold the land and took the price, and is the Hadith "You and your wealth belong to your father" authentic, and what is the role of Sharia courts in such matters in India, and what if they do not exist?

The structure built by the son is his property, and the father is not permitted to take anything from it unless he is in need, and only to the extent of his need. If the father is not in need, it is not lawful for him to take from his son's wealth except with his son's consent.

For a father to be permitted to take from his son's wealth, several conditions must be met: 1. It must not cause harm to the son. 2. The wealth must not be tied to the son's needs. 3. The father must not take the wealth to give it to another son (unless that other son is in need).

If the father takes from the proceeds of the building what he does not need, he must return it. The son and his children may resort to legal action or seek the help of scholars to persuade him to return it.