I know this post was from a few years ago, but I may be able to help.
Here's what I know:
Saunderson was born in Scotland, but I think moved to Ireland, then to US.
Married Mildred Little from Nova Scotia. Her father's name was Hilary Little.
Met Saunderson in Boston while on a trip and married.Moved to NH durring depression, had four children.
As far as I know, he died in Concord, NH on New Years Eve, possibly 1967, but not in Dayton.His daughter Mildred Dunlop did live in Dayton and was married to Clayton Storey.Mildred has passed away, Clayton now lives in Vandalia, OH.Has summer home in Sandbornton, NH where Saunderson and Mildred once lived.
I am decended from Saunderson's second child, Saunderson Jr.
If you would like anymore information please email me.