How is the inheritance distributed among three sisters, two granddaughters (daughters of a son), the children of a deceased brother, and the children of two deceased sisters?

The granddaughter has no share in the inheritance, nor do the sister's children, because they are not among the legal heirs. If the deceased woman leaves no heirs other than them, then her full sisters receive two-thirds, and the remainder goes to her full brother's two sons by ta'sib (agnatic inheritance), based on the Almighty's saying: "But if there are two [sisters], they will have two-thirds of what he left." The estate is to be divided into eighteen shares: the full sisters receive twelve shares (four for each), and each nephew receives three shares. It is advisable to refer inheritance cases to the Sharia courts for investigation and to ensure there are no wills, debts, or other rights taking precedence over the heirs' rights.