Census records help confirm birth and parents:
"United States Census, 1930," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:XH9S-G7Z : accessed 13 August 2018), Mary E Stoner in household of John A Stoner, Madison, Jefferson, Indiana, United States; citing enumeration district (ED) ED 7, sheet 15B, line 90, family 459, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 595; FHL microfilm 2,340,330.
"United States Census, 1940," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:KQHT-3NC : accessed 13 August 2018), Mary J Stoner in household of John Stoner, St. Thomas Township, Franklin, Pennsylvania, United States; citing enumeration district (ED) 28-44, sheet 12A, line 8, family 220, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3510.