This rabbi is well documented but it would help to use the more common spellings of his names: Kalonymos Joffe (many variations of course). His mother was Falka Singer, which should be clarified. It appears that he had a daughter Barucha (Bracha or Brucha), who married Rabbi Eliyahu Kagan. I appear to be a descendant of Barucha and Eliyahu through the Rubin family of Rezekne.