I grew up in Byron, Burns Twp, Shiawassee Co, MI and live only 7-8 miles from there still. Argentine and Gaines (both in Genesee County) are neighboring villages of Byron. I know that Shepard and Atherton surnames are longstanding in the area - and, from my recollection, known as farmers - I think to this day. I also have close friends named Atherton, who I know to be from the Gaines area. I am familiar w/ Byron & Argentine Cemeteries, as I have family in both. (Let me know if I you need headstone pictures. I could try!) Although I am not familiar w/ those you have listed (except Don Shepard seems to ring a bell), I may be able to pick my parents' brains, or my Atherton friends. Let me know if I can try to help.