In going back over my records I found that I have mistaken your William M Grantham for the William G- mentioned in my previous post. Yours is probably related to mine but at a later date. I have found yours in marriage records as William M. Grantham married to Rutha? Brackett in Union Co. GA on July 16, 1876. This can be found on the website:http://graham.main.nc.us/~rjohnson/genealogy/grantham_mar.ht...
Go to Georgia, then to Union County
Sorry for the confusion.