Is it obligatory for the grandson to give his paternal aunts a portion of what he inherited from his grandfather, knowing that the grandfather divided the inheritance equally between his male grandchildren and his sons, and deprived his daughters of the inheritance?

It is permissible for the grandfather to give his grandson whatever he wishes from his money, even if he has direct children, because the grandson does not inherit in this case, and this act does not fall under the obligation of equal distribution among children in gifts. However, the grandfather's act of disinheriting his daughters is an injustice that necessitates a re-division for these daughters.