Is it permissible for a poor widowed mother whose salary is insufficient to cover the expenses of her seven children to spend the intermittent and meager sponsorships of her orphan children on all their siblings?

It is permissible to mix the sponsorship funds with one's private money if the sponsorship does not cover their needs, or covers them with only a slight surplus. Spending on the children, in this case, should be from all the combined funds, in a reasonable manner. Furthermore, the orphans' maintenance must be paid from their own money if they possess sufficient funds.