How is an inheritance divided among a mother, a wife, and a son?

If the deceased left behind only a mother, a wife, and a son, the mother receives one-sixth due to the presence of a lineal descendant (heir), and the wife receives one-eighth due to the presence of a lineal descendant. The remaining portion goes to the son by way of ta'sib (residuary heirship). The inheritance is divided into twenty-four shares: the mother receives four shares, the wife receives three shares, and the son receives seventeen shares.

It is advisable to refer inheritance matters to the Sharia courts for investigation, as there might be other heirs, bequests, debts, or other rights that take precedence over the rights of the heirs.