I've found some records that I think may apply to this family group. There is an Ursen H. Graham and wife Lucy who appear on the 1900 US Census living in Precinct 7, Montrose County, Colorado. The household includes 2 children: Ursen Jr. & Mintee. In 1910, Lucy and her children were living in Gunplain, Allegan, Michigan and Lucy is listed as a widow. There is another child, Opal Graham, b. 1903 in Colorado. I also found Ursen jr. WWI draft registration. Does this match with your information?