I don't know if you are still actively working on this family as your message is three years old, but I am also working on them and I'd like to hear from you to exchange information.
Family legends are fun usually with a small grain of truth to them, as in this case. Marguerite's first husband, Peter Bushaw, Sr., married an Irish woman and lived in Mason Co., Michigan. He did go to North Dakota to visit family, but returned to Michigan. Marguerite also had relatives living in North Dakota. His and Marguerite's sons, David & Peter, Jr. married Indian women, and Marguerite herself was part Indian.