What is the share of each heir from an inheritance divided among three full siblings (one male and two females) and a half-sister from the mother's side, and is the half-sister's claim to half of the inheritance valid?

The sister from the mother (maternal sister) receives one-sixth, based on the Almighty's saying: "And if a man or woman leaves no parents or children but has a brother or a sister, each one of the two gets a sixth." The remainder goes to the two full sisters and the full brother by ta'sib (residuary heirship), with the male receiving the share of two females, based on the Almighty's saying: "And if they are brothers and sisters, male and female, then the male will have the share of two females." Thus, the inheritance is divided into twenty-four shares: the sister from the mother gets four shares, each full sister gets five shares, and the full brother gets ten shares. It is advisable to refer matters related to inheritances to the Sharia courts, or to consult directly with scholars.