Looking for Decendants of Walter James McMath

I am looking for decendants or anyone who may have a family connection to Walter James McMath (b 5/1859 Ontario, Canada, d 3/30/1933 Wilmar, MN) he married Miriam Grim Lyon. Two main locations Watertown, Codington, South Dakota and Elgin, Ontario, Canada.

Children were Dwight Leonard McMath (b 2/18/1894), Miriam Gertrude McMath (b 9/6/1895), Hugh Lyon McMath (b 5/9/1904), John Ralph McMath (b 4/3/1889)

Thank you