Something got me interested in looking for your ancestor's info (though I'm not related). Unfortunately I haven't so far found his death date either. I have seen him in every census from 1860 to 1920 usually in Norwich Twp., Franklin Co., OH (Hilliards). But while I've found death certificates for several of his children, including John, I haven't found a death date for Miles. It appears his wife Alice died between 1900 and 1910 and that they had 15 children. It also appears Miles' father was b ~1801 VA and was named something like Yammer Merchant.