I am looking for information about Frederick Yoos b. 1894 in Pennsylvania. He is listed in the 1930 census married to Elizabeth Yoos. According to the 1910 census he is 16 and lives in the Pfaff household in Philadelphia, PA. Fredrick Yoos is possibly the nephew of my great grandfather George Pfaff or the nephew of my great grandmother Mary. Fredrick Yoos worked in the Philadelphia Arsenal; the same place as my great grandfather and grandfather.