How is the aforementioned inheritance to be divided, taking into consideration one of the sons' contribution to purchasing the land and adding a sum to complete the construction, the sale of the old house, and the registration of the land's ownership in the mother's name?

If one of the sons pays from his private money the price of the land and an amount to complete the construction, he becomes a partner in the new building to the extent of what he paid. This is taken into account when dividing the inheritance; the share of the heirs is divided first, then his special share of the house is given to him. The rule is that whatever one of the heirs adds to the inheritance before its division makes him a partner in proportion to what he paid, unless he donates it. As for the division of the inheritance, the wife gets one-eighth due to the presence of a lineal descendant, and the remainder goes to the children, with the male receiving the share of two females.