Don't have anything on your Rawleigh but he sounds like a relative.My Rawleigh Sr. (b. abt. 1736) had a son named Jessee ( maybe a family name?)
Most of my information about this family at this point is from Connie Street who uses this forum too.Suggest you contact her directly - see her reply to my e-mail about Eulalie Mildred Alexander.I can give you the citation on the records she gave me to back up the marriages but I think you would do better to ask her directly - she has been researching for twenty years and she may have something directly useful to your own specific goals.There is no direct trail that I know about from your Rawleigh to me - the realtionship would be from farther back - so she wouldn't have sent that information to me if she had had it.
What is the source of your information on your Rawleigh?If he is indeed a nephew, information on his parents might lead me to documentation on his grandparents, i.e. Rawleigh's parents.