When Peter John Ferguson was born on 16 October 1866, in Priceville, West Grey, Grey, Ontario, Canada, his father, Alexander John Ferguson, was 34 and his mother, Catherine Mc Lean, was 21. He married Minnie Marie Staude on 24 December 1890, in Grand Forks, Grand Forks, North Dakota, United States. They were the parents of at least 2 sons. He lived in Larimore Township, Grand Forks, North Dakota, United States in 1900 and Grand Forks, North Dakota, United States in 1915. He died on 7 December 1939, in Grand Forks, Grand Forks, North Dakota, United States, at the age of 73, and was buried in Grand Forks, Grand Forks, North Dakota, United States.