Hmmm.The parents you mention are Clark Lewis Miller b April 1851 d 26 Dec 1905 m 26 Nov 1876 Anna Eliza Hogg "Lida" Pumphrey b 6 Jun 1857 d 16 May 1923 (All in Licking Co., OH mostly Croton, Hartford Twp.)But the only child I have of them is Harrison Reason Pumphrey Miller b 16 Jul 1878 d 30 Mar 1957.Now Clark's parents were David Miller b 27 Jan 1822 d 13 Mar 1899 m Margaret Canard (Conard?) Evans b 18 Jul 1827 d 16 Dec 1899.
Was your Robert Lee Miller born after 1880 and did he leave before 1900?That would explain why I don't see him in the 1880 or 1900 censuses. I've communicated with a couple of other people who are interested in this line and I'll try to put you in communications with them if you e-mail me.Actually I'm somewhat interested in this line myself as I don't know exactly how David Miller is related, just that according to the 1880 census both he and Margaret had parents from VA.My own Miller kin come from western PA which was a part of VA at one time.