How is the estate of the grandfather divided, knowing that the majority of this estate is due to the effort and labor of the deceased son, among the heirs: a male son, 6 daughters, a wife, a deceased son's wife, a deceased son's daughter, 2 deceased son's sons, and a deceased son's daughter?

If the deceased has no heirs other than those mentioned, then his wife receives one-eighth, based on the Almighty's saying: ﴿But if you have children, then for them [the wives] is one eighth of what you leave, after any bequest you [may have] made or debt.﴾ [An-Nisa: 12]. The son and the six daughters receive the remainder by asabah (agnatic inheritance), with the male receiving the equivalent of the female's share, based on the Almighty's saying: ﴿Allah instructs you concerning your children: for the male, what is equal to the share of two females.﴾ [An-Nisa: 11].

The son's wife is not among the heirs, and a son who dies before his father does not inherit, nor do his sons and daughters, due to the presence of their uncle who blocks them from inheriting. If your father built those properties and assets as assistance to his father, this does not give him a right to them. However, if he was a partner with his father, the ruling differs.

Finally, inheritance issues are serious and complex. The estate cannot be divided until the heirs are correctly identified. Therefore, it is advisable to refer to the Sharia courts or people of knowledge to ascertain the heirs, bequests, and debts, as these take precedence over the heirs' rights.