There is a Beatrice McMahon listed on the 1930 census in the town of Groveland, Livingston Co. She & her husband are employees of the Craig Colony Institution. The record reads:
1930; Census Place: Groveland, Livingston, New York; Roll: 1445; Page: 21A
McMahon, Thomas, employee, age 33, married at age 22, b. NY, father b. Irish Free State, mother b. Canada, occ. attendant
- Beatrice, employee, age 29, married at age 19, b. Penn., parents b. Penn., occ. cook
- Thomas, son, age 7, b. NY
- Robert, son, age 5, b. NY
The 1910 census for Westfield, Tioga Co., PA has a Parsons famliy headed by Frank, wife Jessie, with seven children including a Beatrice, age 9. Let me know if you want me to type up this record.