Is it permissible for a mother to favor some of her children with financial gifts—due to their lack of income—while withholding gifts from others—because they are salaried individuals—knowing that the latter do not object to this?

A mother must be just among her children in giving gifts, unless there is a legitimate reason that permits preferring some over others. Among these reasons are: the poverty of one of them over the others, or singling out some due to their need or a virtue they possess such as knowledge, or withholding a gift from one of them due to their transgression or innovation.