Does the deceased (unmarried) son inherit what remains of his father's estate, knowing that he had received some of it during his lifetime, and to whom does his share go, and how is it divided?

The deceased's property is divided among his heirs after paying off his debts and executing his will. The son receives his full share of his father's inheritance. If he dies, his share passes to his own heirs: his mother, his full brother, and his four full sisters. His paternal half-brothers and half-sisters receive nothing due to the presence of a full brother. The mother receives one-sixth, and the remainder goes to the full brother and full sisters, with the male receiving the share of two females.