Here is more information, from Matt Lipsey, that you might find useful.Matt has done a lot of research on the Gunn line, especially in Michigan.
"Milton, Ada, their son Ford, and daughter Myrta DUFFUS, are all buried at Mt. Hope Cemetery in Lansing, Ingham, MI. Milton passed away in 1925---Ada in 1920--Ford in 1945--and Myrta in 1957. In the 1900 Census there are two other sons who I will be searching for in 1910 and 1920, Earl GUNN (b. May 1884, MI) and Russell GUNN (b. March 1888, MI)."