Johm Maxwell & Janet Cunnigham do appear to have a son James Maxwell. That information comes from the LDS. It is one of those overly ambitious workers making a connection. My grandfather's half brother did the work, so we had all accepted it. As we went back to verify it I discovered James Alexander Maxwell who married Margaret Spence was still living in Scotland with his parents when John & Janet and their James was in America. James & Margaret are buried in Newark, NJ. They are my grandfathers grandparents. James MAlexander Maxwell's parents: Archibald Maxwell are buried in Greenwood Cemetery, Brooklyn, NY/
I am part of the Maxwell DNA project, There is no close link to the John& Janet Maxwell.