I have a Sarah Fishman (who died at the age of 102 in October 2007, I believe) as being the daughter of Henry and Esther Luban from Rezekne, Latvia. Henry and Ester's kids were: daughters Belle, Sarah, Minnie, Sophia and Helen, and son John. Sarah's married name was Fishman, Helen's married name was Holtzman amd Belle's married name was Garfinkel. It is possible either that your Sara Fishman is different than my Sarah fishman, or the Moishe and Frieda you have listed as her parents were her in-laws. If your Sara Fishman is the same as my Sarah Fishman, then Henry/Henoch Luban and Esther/Menucha Galbraich were her parents. Henry's father was named Schmuila Jankel Luban and Henry's mother was Kreine Luban. Schmuila Jankel's father was another Genoch Luban. And that is as far back as I can trace the Lubans. Hope this helps!