Ind. Code § 21-30-5-5

Sec. 5. To secure the payment of annuities granted under section 4 of this chapter, the property comprised in the gift, devise, or bequest may be pledged by way of mortgage or otherwise to the annuitant or annuitants for the full period of the life of the annuity or annuities. The property pledged is the sole guarantee, and the donee may not be obligated in any other manner unless by written agreement of the donee.