What is the share of each heir from the estate of the deceased woman, who leaves behind one son, one full brother, one full brother’s son, a husband, and one full sister?

If the deceased woman left no heirs except a husband and a son, the husband receives one-fourth due to the presence of a lineal descendant, and the remainder goes to the son by ta'ṣīb (agnatic inheritance). The rest of those mentioned are excluded from inheritance by the son (ḥajb ḥirmān). The estate is divided into four shares: one share for the husband and three shares for the son.