my mother was visiting from Canada this past Christmas. She signed a typed document addressed to a nephew who has been overseeing land for her. She has transferred the responsibility of overseeing the land to me, her daughter. The one-page letter has her signature, mine, and a witness'. She is back in Canada and will be sending the document to her nephew. It occurred to me that we could have gone to a notary public for this. Don't know if that was need. Is the document binding?