How is the estate of a man who died and left a wife, a full sister, and children of a half-brother (males and females) divided?

The deceased's wife receives one-fourth if he has no children. His full sister receives one-half. The remainder goes to his paternal nephews by ta’sib (agnatic inheritance). As for maternal nephews, they inherit nothing. The full sister inherits the remainder by radd (return) after receiving her half and the wife receiving one-eighth. The nieces (daughters of the brother) have no inheritance whatsoever.