How is the estate of a mother who left real estate to her heirs distributed, given that two of her sons died during her lifetime, and then two others died after her passing?

The two full brothers who died before their mother have no share in her estate, and similarly, their children are completely excluded from inheritance by their uncles.

The brother and sister who died after their mother inherit from her, and their share transfers to their heirs.

If the mother died leaving only three sons and three daughters, her estate is divided into nine shares: two shares for a male and one share for a female.

Inheritance matters must be submitted to the Sharia courts for investigation, as there might be factors delaying the distribution, such as bequests, debts, or rights.