How can a will be written in accordance with Islamic Sharia, taking into consideration leaving the house, which represents 80% of the wealth, to the heirs, and dealing with the mentioned relatives (wife, two sons, mother, sister, maternal grandmother), and the fact that the absent father has not provided for the family for 23 years?

It is not obligatory to write a will concerning the division of the inheritance before death, as inheritance is actualized upon the death of the inheritor, and the shares of the heirs are legally determined, unless there is a fear of corruption or non-application of the Sharia (definition). If the heirs are limited to: the wife, two sons, the father, and the mother, then the wife receives one-eighth, the father and mother each receive one-sixth, and the remainder goes to the two sons. It is not permissible to bequeath to an heir more than their prescribed share. The sister is excluded by the two sons and the father, and the grandmother is excluded by the mother. It is permissible to bequeath to the sister and grandmother an amount not exceeding one-third. Justice must be observed among children in gifts and endowments, such that the male receives the share of two females, and if justice has not been achieved, then either the deprived must be compensated or the gift must be returned.