What is the ruling of Islamic law regarding claiming inheritance in a house that the father sold to his sons with a registered contract 38 years before his death, especially since the other children had forgiven their father before his death, and they have their own independent lives and homes?

If the contract for the sale of the house was genuine and the price was paid, then the house belongs to you, and no one else has a right to it. However, if the contract of sale was a sham, then if the intention was a bequest to you after his death, this is a bequest to an heir, which is not permissible without the consent of the other heirs. But if the intention was an immediate gift and you took possession of the house before his death, then the house is yours, even if your father was not equitable in the gift. If you did not take possession of the house before his death, then the gift was not completed, and the house becomes an inheritance to be distributed according to Islamic law. The conditions for possessing a gifted house vary among the jurisprudential schools, and the ruling of the Sharia court resolves disputes in these matters.