I'm fairly positive that the answer to your headline question is no. No one can "borrow" a Tax ID. But if OOM was part of your PTO or became part of it or if your organization with IRS was more a compilation of school-support organizations (as opposed to just schoolwide PTOs), then you could maybe make a system work.
But if they have own accounts and own organization and no real formal connection with your group -- I'd say no.
Remind them that it's not very hard to get their own EIN.
Tim
- Rockne
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