Do the children of a deceased son inherit from their deceased grandmother, and what is the validity of what is known as the obligatory bequest, knowing that the deceased did not bequeath anything to them, and is there any advice for the children of the deceased?

When a person dies, their estate is divided among their living heirs only. The deceased son has no share in the inheritance, and his children also do not inherit due to the presence of uncles. It is recommended to give the children of the deceased son something from the estate, either through a will not exceeding one-third, or as a donation from the paternal uncles and aunts, especially if they are in need. The children of the deceased son must not demand money, because they have no legal right to it according to Islamic law.