Is the legitimate and legal right of a son to own a house gifted to him by his father forfeited due to the father's failure to register the house in his name at the real estate registry, despite his acknowledgment of the gift before the other children, and is it permissible for the son to file a lawsuit to prove his right?

If a father gifts a floor to his son and the son occupies it, the explicit statement that it has left the father's ownership and is in the son's possession does not invalidate the gift. The lack of official documentation does not negate the son's right to ownership, especially if the father compensated the remaining heirs (his daughters) with money, jewelry, and assistance in building. The matter may be brought before a court, but it is better for the heirs to strive for an agreement.