What is the jurisprudential ruling regarding the inheritance of a rented apartment by the wife or relatives, and what is the fate of the money paid for the apartment?

If the apartment is owned by the father and rented out, he has the right to reclaim it upon the expiration of the lease agreement or at any time he wishes, because it is a usufruct contract limited by a specific period. The tenants do not have the right to inherit it or retain it without the owner's consent. As for the amount you spent on the apartment, if it was a gift, you do not have the right to claim it. If it was not a gift, then you have the right to reclaim it from the apartment owner.