Scott,
Can you verify that this is Mathew G. buried there? I have seen a picture of John's headstone but not M.G.'s. Do you live near there so that you could take a picture of it? Also, is their homeplace still standing? Do you know the address or coordinates of it, if it is? Would love to pull that up on google maps or something. Also, would love any additional information on either of these two men. Thanks!