In White v. Brennan's Adm'r, 307 Ky. 776, 212 S.W.2d 299, 302 (1948), due execution was convincingly established by the attorney who had retained a carbon copy of the testator's will which had been lost. He testified that he had prepared the will, that he was familiar with the requirements for a valid will, that he remembered the execution ceremony of the particular will in question, and that he had observed the signing of the will by the two witnesses. However, White does not hold that due execution can be established without the testimony of at least one person, either an attesting witness or person who witnessed the formal will-signing ceremony contemplated by the statute.