I too am doing some research on the Haddows of Dreghorn, Scotland. My great-aunt, by marriage, Mary Lou Haddow was the daughter of Archie Haddow, son of John Haddow and Agnes Haddow. Mary Lou Haddow, married my great uncle, William Patrick King in September 1962 in Raton, NM. At the time she was Mary Lou Piper so I assume this name was from a previous marriage. They lived in Denver, Colorado (no children) until their deaths, his in 1976, hers in 1981. Her brother, Robert Haddow also lived in Denver and I believe died in 1989. I would be interested in learning more about the Haddows and would be happy to share any information I have found if interested.