I have not made a point of collecting Graves, but yes there is a tie-in of Graves and Luther, mostly with the Jacob Luther family, who came from Randolph Co a little later than the Christian Luther family, and not all at once, but seemingly one family at a time. Fannie Graves married Michael Luther in 1825 in Randolph Co, if that is any help. The bondsman was Leonard Graves, who married Sallie Luther in 1827, not sure they came out to Indiana..