Are the heirs entitled to divide the sum that the grandfather gave to his daughter ten months before his death, knowing that the inheritance has already been distributed?

If the deceased has no heirs other than a daughter and paternal cousins, the daughter receives half as a prescribed share, based on Allah's saying: (And if there is only one, she will have half). The remainder goes to the paternal cousins by way of ta'sib (residuary inheritance) equally, based on the Prophet's (peace be upon him) saying: (Give the prescribed shares to those entitled to them, and whatever remains is for the closest male relative).

It is permissible for a father to gift his daughter whatever he wishes from his wealth during his lifetime, if he has no other children. If the daughter takes proper possession of the money, the gift is valid, and the heirs are not permitted to dispute it, because the right to revoke a gift ceases upon the death of the donor and does not transfer to the heirs, as it is a personal right that is not inherited. Consequently, the heirs have no right to the money that the father gifted to his daughter, and if they dispute it, they must return it to her, and she has the right to prevent them from taking it.