What are the rulings regarding obligatory and non-obligatory expenses from a father to his children? Is justice obligatory among the children in these expenses, and what is the daughter's share therein?

Justice between children in gifts and donations is obligatory, unless the need of some necessitates preferring them. If a father gives some of his children something in excess of their maintenance, he must equalize them either by returning what he gave, or by gifting the rest of the children similarly. There is no difference in this between the older and the younger; so if he gives the older an amount in excess of maintenance, he must give the rest a similar excess. As for marriage expenses, they are only given when there is a need. It is not permissible to make a will for unmarried children, because marriage is a matter of fulfilling needs, so it is not permissible to make a will for someone who has not reached the age of marriage. As for those born after the gift, there is a dispute regarding the obligation to equalize them, and it has been said: it is obligatory. Equalization is done by giving the male the share of two females.