Hi Rosemary, I found this Melvin in the 1871 census. Cardross 18 West Bridge Margaret Melvin Head Mar 37 occ: keeps house b. Glasgow John son 12 scholar b. Dumbarton Agnes dau 10 scholar b. Dumbarton Catherine dau 6 scholar b. Dumbarton William son 3 b. Dumbarton Karen in warming up S. Ontario