As legal guardians, you are entitled to the exemption for your grandchild, but only one of you can claim it. Decide who should do this; it depends on who will save more in taxes for the family. You do not apportion the exemption between you.
Debt on which a person is not personally liable. In case of nonpayment, the creditor must foreclose on property securing the debt. At-risk rules generally bar losses where there is nonrecourse financing, but an exception applies to certain nonrecourse financing for real estate.