There's a Mary Sekerchaks b. ca 1878 in Austria Married to Joe, and daughter, also Mary Sekerchaks, b. 1905, also Austria--along with Philip (your father?)b. 1901. It looks like you. There's also a Susan
Tobias, b. Austria 1870 in Swoyerville in 1920--maybe Mary's sister. I didn't find any candidates for parents in PA that same year so you may have to search Austria records