Sorry, but no way would I ever be able to stretch the language to allow this as a hardship. If you really think it is doable, then you need to request a ruling from the IRS to clarify, but barring that, it is NOT a purchase of his primary residence, it is effectively a rental payment to someone else and that is not a permissible hardship distribution.
Anyone who advises a client that this is ok has no basis for such a decision (no regs, no cases, nothing but their own tortured reading of the law), and that's a good case of a malpractice claim.
FWIW.