Do the brothers and sisters of the deceased inherit what their father inherited from their deceased brother's wealth, and what is their share, and does the financial grant or gift that devolved to the deceased after his death fall within the estate?

If a son dies and his estate is not divided until his father also dies, this issue is called "Munāsakhāt" (successive inheritances). The son's estate is first divided among his living heirs and those who died after him. Then, the father's estate (which includes what he inherited from his deceased son) is divided among his heirs, noting that sons exclude brothers [from inheritance].

The son's estate is divided into 120 shares: the wife receives 15 shares (one-eighth), the father receives 20 shares (one-sixth), each son receives 34 shares, and each daughter receives 17 shares.

Then, the father's estate (which includes the one-sixth he inherited from his son, and what was gifted to him during his lifetime) is divided among his heirs, consisting of sons and sisters (if there is no exclusion).

Warning: Inheritances are a serious and complex matter. A mere fatwa is insufficient; rather, the matter must be referred to the Sharia courts for investigation and to ascertain all heirs, debts, and bequests before distribution.