The David Maxwell you mention born about 1789, angus dunnichen and Eliz Helen Grey b. 1831 is connected to my Maxwell line. However not through this David Maxwell.
David and Elizabeth's child John Adam Smith was married. His second wife was my husband's 2nd great aunt: Jennie Maxwell. Jennie was sister to James Alexander Maxwell. She was born 7/24/1847 Lanark, Scotland, die 10/1/1940 White Bear, CANADA.
John and Jennie had 6 children, Leonard Geroge, Lenora Gertrude, James Alexander, Ella May, Ada Jane and Helga.