I notice in the 1920 census, Mabel McDougall is living in Walworth, Wisconsin, divorced. Her two children are
Francis, age 9 and Margery, age 7, born in South Dakota.
In the 1910 census, there is this listing for Newport, Marshall County, South Dakota
Henry McDougall, age 24, born Wisconsin
Maybelle H. McDougall, age 21, born Wisconsin
Edward H. McDougall, age 1 year, 3 months, born South Dakotahttps://familysearch.org/pal:/MM9.1.1/MPXP-2M5