For all we know, the original grantor of a family trust could now be deceased and the successor trustees are managing the assets.
FAQ #19 is very clear that the trustees are the natural persons for the purpose of the ownership prong. In the case of John Doe's Trust, the person opening the account can pick one of the two trustees to list on the certification.
_________________________
Sola Gratia, Sola Fides, Sola Scriptura, Solus Christus, Soli Deo Gloria!
www.tcaregs.com