Several trees show Louis as Brett's ggg grandfather, but the only sources that they provide are other family trees. I was unable to find any original documentation. Brett and many, if not most, Favres found along the Gulf Coast are supposed to be descended from a Simon Favre who lived in the late 18th and early 19th centuries, and one of his mistresses, a Choctaw woman named Pistikiokonay. In fact, on some census records you will find the Favres in that area shown as Indian.