What is the share of each heir in four consecutive cases for the estate of a husband who died, leaving behind his wife, three sons, and two daughters—one of whom is from another wife—then one of the sons died, then the second son, then the full sister?

This issue is called "Al-Munāsakhāt" (successive inheritance), which occurs when a person dies before their estate is distributed, and then one or more of their heirs also die. The easiest way is to divide the estate of the first deceased among all their heirs (both living and those who have died), and then take the estate of each deceased heir and divide it among their own heirs.

1. The first deceased: Their estate is divided into 64 shares: 8 for the wife, 14 for each son, and 7 for each daughter. 2. The second deceased: Their estate is divided into 6 shares: 1 for the mother, 2 for each full brother, and 1 for the full sister. The paternal half-sister is excluded. 3. The third deceased: Their estate is divided into 18 shares: 3 for the mother, 10 for the full brother, and 5 for the full sister. The paternal half-sister is excluded. 4. The fourth deceased: (If the paternal half-sister is alive) Her estate is divided into 6 shares: 1 for the mother, and 5 for the full brother. The paternal half-sister is excluded.

It is advisable to refer such matters to Sharia courts for precise verification of all heirs, wills, debts, and other rights before distributing the estate.