I am the executor for an estate. After a long battle with cancer, oddly, the deceased's brother has come forward with a claim that he loaned his brother $1,500,000 over 5-6 years. There is no one else to substantiate this claim. He states it was an oral agreement and has shown amounts that have come out of various bank accounts. Prior to this, he has never demanded payment. If he is the only witness to testify, can he really be deemed credible without the decedent here to defend himself? We also can't understand why he never brought this to anyone's attention during the course of his brother's terminal illness, as they were on good terms. How can we be sure this was actually a loan versus a gift? They were also partners in an LLC and co-mingled money regularly.