Is it obligatory to calculate the share of the paternal aunts from their grandfather's land, which he registered only for his male children, knowing that some of the paternal aunts have passed away?

If the grandfather bequeathed his land to his male children with the intention that it would be theirs after his death, but did not transfer ownership to them during his lifetime, this is a bequest to an heir, which is not permissible unless the other heirs consent. The sons and those who inherit from their deceased members must re-divide the land among all heirs, unless the living disinherited heirs and the heirs of the deceased consent. If they refuse, then give your living paternal aunt and the heirs of your deceased paternal aunts their share of what your father took. It is best to refer the matter to the Sharia court.