Possible 4x Great Granddad Robert (Mc) Laughlin. Research.
Only relatively recently, have I learned & recognized, a "Robert Laughlin," (according to a biographical narrative of Dr. Jonathan Currier, a great grand uncle) to be the father-in-law of our 3x grt. granddad, Jonathan Currier. The article reads 'Mclaughlin,' making this gentleman less likely, although, any number of short errors or oversights, might explain any discrepancy. So much greater chance for error when 'any' part of a name is missing.