Is it permissible to designate money or an apartment for young children to ensure their education and future, especially since the older children have already had their share of education and marriage expenses?

Justice between children in gifts and endowments is obligatory, unless a special need necessitates preferring one of them to the extent of their need. Equality in expenses is not obligatory; rather, the father should spend on each child according to their need. Justice in this matter means giving each of them what they need without linking it to what is given to others. If adults are spent upon according to their needs and are not favored with a gift, then it is not permissible to give a gift to minors without also giving to adults. It is wrong to dedicate a marriage endowment to those who have not reached the age of marriage, as marriage falls under the category of fulfilling needs.