I had an aunt that gave me $5,000.00 in a check to help pay for my tuition. When she wrote the check she stated "as a loan." at the end of the semester i wrote her a letter in regards to paying the money back. She responded on a christmas card she sent me and said "on money, keep it no need to return." unfortunateky she passes away, and now her administrator is trying to sue me for the funds after he found the canceled check.is that possible?