My grandfather told my mother (before she emigrated to Canada, 1956) that we had family in Boston and that one member was even a rabbi. Once we arrived in Canada, she tried to find him but had no luck. She died in 1988. Fast forward to 2014. I emailed a distant cousin whether he knew anything about the family in Boston. Sure enough, the cousin knew about them and even had their email addresses. We went to Boston, visited with the family (grandchildren of the rabbi) and I copied photos of him and his sons. Rabbi Rafael Landau (1877-1955) was my grandfather's first cousin. By the time my mother searched for him, he was long dead.
TSCHERNIA of Copenhagen, Denmark, & Genichesk, Kherson Oblast, Ukraine
SHLAMOWITZ/SZLAMOWICZ/BIRENCWEIG of London, England; Lodz & Jezow, Poland
SEIDLER/ZAJDLER/LANDAU of Lodz & Sulejow, Poland
ROSENFELD of Raków, Kielce, Poland
SHKOLNIK/TICK[ER] of Ladyzhyn & Bershad, Vinnytsia, Ukraine