1940 Census, Pittsburgh, PA, May 6, 1940, 208 E. Stockton Ave.:
Vallas, Agnes, 39, married, 7 years of school, b. PA, lived in same house in 1935, assembler, museum project

Obituary, The Pittsburgh Press, Monday, August 26, 1946, p. 18:

Vallas—On Sunday, Agnes Machnik [sic], mother of Lillian Grimm, sister of Mrs. Marie Templeton. Services at the chapel of Walter J. Sperling, 622 Lockhart St., on Wednesday at 2 o’clock. Friends invited.