How is inheritance calculated for an estate that includes five sons, four daughters, and a wife, with a will stipulating one-third of the assets for an annual sacrifice, sponsoring orphans, and charitable works, in addition to a house inhabited by the mother that the heirs wish to remain as her residence?

If the heirs are limited to those mentioned, the wife receives one-eighth due to the existence of a lineal descendant (heir-apparent), and the remainder goes to the sons and daughters, with the male receiving the share of two females. The estate is divided into 16 shares: two shares for the wife, two shares for each son, and one share for each daughter.

The will must be executed as long as it falls within one-third of the estate. As for the house, if the adult, mature heirs relinquish their right to it in favor of their mother, it becomes her property. If they agree to postpone its division so that it serves as her residence, this is permissible, and each heir retains their right.

Matters of inheritance are serious and complex, and a mere fatwa is insufficient. Rather, it must be referred to the Sharia courts to investigate the existence of any other heirs, wills, debts, or rights that take precedence over the heirs' rights.