Is it permissible to spend the monthly aid that some orphaned siblings receive from charities on all needy siblings, or is its expenditure restricted to only those in whose name the aid is given?

It is permissible to spend the amount designated in the names of some brothers on the entire family if the granting entity intends to assist the whole family, and the naming of specific beneficiaries was merely to fulfill official paperwork requirements. This is typically the case with charitable organizations. However, if the entity intends to sponsor only the designated individuals and no one else, then it is not permissible to spend the amount on others.