Is it permissible for a father to transfer the title of a building to his only daughter, knowing that he owns nothing else besides her and two plots of land, and that the rest of the heirs are not pleased? And does the building become part of the inheritance after his death?

A father must be equitable among his children in giving gifts, and it is not permissible to favor some of them except for a legitimate religious reason, such as need. Favoring children without a valid reason is an injustice and oppression, for the Prophet, peace and blessings be upon him, said: "Fear Allah and be just among your children."

Therefore, what the father did by singling out his daughter from his second wife with the building as a gift is not permissible. He must either revoke it or give a similar amount to his other children.

If the father dies before revoking the gift, and the gift was valid (the daughter took possession of it after reaching maturity, or she took possession of it during his lifetime if she was young), then she alone is entitled to it, and it does not become part of the inheritance.

However, if the father dies before possession took place, and it was merely a matter of writing, then the gift is void upon his death, and the building is divided with the rest of the inheritance among all heirs.