Hello - so glad to see your post. Nelson's middle name was Samuel so actually it is just Nelson and Sarah Ann (that I know of).Nelson was my great great grandfather. He was married two times - Mary Owen was his first wife and they had one son, Jabez. They divorced. His second wife (and my gg-grandmother) was Amanda Greer and they had 3 children, John, Hugh (my g-grandfather) and Sarah.I have been able to find out a lot about Amanda Greer as the Greer family has a long history in Williamson County.Unfortunately, I am just as stumped as you as to the parents of Nelson and Sarah Ann.I hope to return to Williamson Co. soon and do some more research - specifically to see if I can find any other records on Nelson Allen and Sarah Allen.