Peter and his sister Margaret were with his grandparents, the William and Catherine Martin family, in the 1900 census in Bangor Township, Pope County. Their mother had died two years earlier. They are still with them in the 1910 census, but in Sedan, Pope County.
On October 12, 1921 his Margaret married Joseph Wirtzfeld in Villard, with the reception at the home of the William E. Martin family there. Lyle Martin, age nearly 13, remembers Margaret Brown Wirtzfeld saying she had reached her father who was working in North Dakota at the time, but that he was unable to come for the wedding.
In 1930 they're living in Martin, Sheridan, North Dakota with four children.