Who inherits from a grandmother who passed away after her son (the questioner's father), and who has a full sister and a deceased brother who has sons and daughters, knowing that the heirs of her son (the questioner's father) have not yet distributed his inheritance?

If an heir dies before the distribution of the inheritance, their share does not lapse with their death but rather goes to their heirs. Thus, your paternal grandmother's inheritance does not lapse with her death; rather, it is allocated to her, and then distributed among her heirs. If the grandmother died leaving behind a full sister and nephews (sons of a brother), her inheritance would go to her grandchildren (sons and daughters of her son). The full sister and the nephews are excluded by the male grandchildren (sons of her son) with an exclusion of deprivation. The grandmother's inheritance is divided among her son's sons and daughters, with the male receiving the share of two females.