Birth Registration, Wellington County, Arthur Township, Ontario, Canada:
Peter Francis, 17 September 1885
Father: Lawrence McMahon, Farmer
Mother: Mary McMahon (her maiden name)
Informant: M. G. Miller, Tevistdale(?)

WWI Draft Registration Card, Sept 12, 1918 p76/469
Birth date: September 17, 1885
Residence: Main Ave. So?, Kaukauna, Wisconsin
Canadian Citizen
Occupation: Office Clerk at Tenson(?) Bag and Paper Co. KauKauna
Nearest Relative: Leona McMahon
Light Brown Hair and Eyes

Found Lawrence Patrick McMahon in adjacent record for same date. Also from Canada. Birthdate Dec 22 1881.

1920 US Census, Wausau Ward 1, Marathon, Wisconsin (Renting @ 801 Dunbar St.)
Mc Mahon, Peter F, age 34, immigrated 1889, manager at bag factory, born in Canada, father from Ireland, mother from Canada
Leona, wife, age 34, born in Wisconsin, father born in Germany, mother born in Wisconsin
Alice Mary, daughter, age 6, born in Wisconsin, father born in Canada, mother born in Wisconsin
Leona M., daughter, age 4, born in Wisconsin, father born in Canada, mother born in Wisconsin

1930 US Census, Bogalusa, Washington, Louisiana, April 5, 1930, (Renting @ 317 Alabama Ave.)
Mc Mahon, Peter F., age 44, married 23 years, manager in a bag factory. Born in Canada, father from Ireland, mother from Canada, immigration 1890, naturalized.
Leona, wife, age 44, born in Wisconsin, father born in Germany, mother born in Wisconsin
Alice, daughter, age 17, born in Wisconsin, father born in Canada, mother born in Wisconsin
Leona, daughter, age 14, born in Wisconsin, father born in Canada, mother born in Wisconsin

Holy Cross Cemetery, Section 3 near Kaukauna, Wisconsin:
Mc Mahon Leona K 1885 1950    
Mc Mahon Pete F 1885 1957