What is the ruling on an uneducated sister waiving her share of the house without knowing the reality of the papers she signed, and what is the ruling on the house that the two younger brothers have acquired in Sharia, and is it considered lawful wealth?

Registering property to some heirs without actual transfer of ownership is not a legitimate transfer of ownership; rather, it is a fictitious sale. The estate belongs to its original owner and must be divided among all heirs according to their shares. Writing the house in the wife's name in this manner does not truly transfer ownership, and the sons' relinquishment is not valid. Gifts to children must be made justly, and they are null and void and revert to the estate if one child is favored over others without a legitimate reason. A gift is not effective unless the donee takes possession and control of the gifted item during the lifetime of the donor; otherwise, it is considered void and must be divided among the heirs. Matters of inheritance are sensitive and complex, and they must be referred to the Sharia courts for investigation.