Did Sarah die in Cook County? Have you looked for her death certificate? Ancestry and familysearch both have transcriptions of Cook Co DCs up to, hmm, 1940s? and Ancestry has the index for more than that. Cook Co genSoc has an online index up to privacy laws (50 years, I think).
the website jewishdata has POW extensively indexed. Jewish gravestones may have father's name (in Hebrew) on them.