Do grandchildren have the right to claim their deceased mother's share of their grandmother's land, which the paternal and maternal uncles and aunts inherited?

Your grandmother's land belongs to all heirs, including your mother. Your mother is entitled to a share of your grandfather's inheritance if she passed away after him. The rights of deceased heirs are transferred to their own heirs. You have a right to the land because you inherit your mother's share of it. If the land will not be damaged by division, the heirs have the right to divide it and take their shares. However, if division would diminish its value, they have the right to demand its sale and the distribution of the proceeds. Preemption (Shufa'a) is the right of a partner to acquire their co-partner's sold share for its price. If the nephews wish to sell their share, your aunt (and the other partners) have the right of preemption over it, proportionate to their shares. If the other partners waive their right, she has the right to acquire the entire land.