I am beginning to think that no one knows the names between them as I've never seen it before and I noticed no one has answered your question either since you posted this quite a while ago. I think Andrew may have just been using a friendly term of "auntie" or whatever he called Ann when he wrote that letter. In the South neighbors often referred to elderly women they were familiar with or had grown up around as "Aunt" so and so or "Uncle" so and so and I believe this could be a case of just that since no one has provided the genealogical information showing the link between the Moody's and Andrew Jackson's family...at least not that I've seen anyway. Perhaps it is there somewhere after all though. It would be nice if someone would specifically provide that for everyones benefit if it is there since I am a Moody and also have Jackson's in my family tree.