What is the share of each heir from the inheritance, knowing that the heirs of the deceased are: the mother, three full sisters, and three full paternal cousins?

If the deceased leaves behind only a mother, full sisters, and full paternal cousins, then the mother receives one-sixth due to the presence of a group of sisters, and the term "brothers" includes females. The full sisters receive two-thirds, and the remainder after the mother's and sisters' shares goes to the full paternal cousins by virtue of ta'sib (residuary inheritance), and it is divided equally among them. Thus, the inheritance is divided into eighteen shares: the mother receives three shares, the full sisters receive twelve shares (four for each), and each full paternal cousin receives one share.