I am searching for my great grandmothers maiden name. Her name was Mary Alice Unknown Knauff. She had three sisters; Naomi unknown Bailey, Erma Unknown and Francis Unknown.

I have attempted to search for the four sisters to lead me to thier common maiden name. But have not gotten any where, both Naomi and Mary lost sons to the same auto accident and there are numerous Baltimore Sun articles, but no hint to their parents. One of the sister lived on N Poppleton ST in 1917, but I think the article might be mistake as my grandmother was white and the population of N Poppleton St was black in the 1910 and 1920 census. (I could be very wrong about that assumption.)

She passed in PA, they are 6 mos behind in sending out death Certificates.

Any help would be great