The family of Moshe Schwartzberg started out, as far as we know, in Panemunelis, but eventually moved to Rokiskis. And the family members that we know the most about eventually emigrated to the United States, first to Massachusetts, then to New York. Moshe and his wife (name not known) had two sons, Zalmen Shimson (born 1841) and Abba Velvel. We don't know of any more children.
Abba Velvel had a son and a daughter, Benjamin (1891-1985) and Bessie (1892-1970). We don't know of more children. Zalmen Shimson had 10 children: Riva (1866-1940), Musha (1867-?), Mendel Leibe (1869-?), Leah (1873-?), Chaim Motel (1874-?), Chava (1878-?), Israel Itzhak (1880-?), Max (1881-1918), Joseph (1883-1950), and Fanny (1889-1953).
[Abba Velvel's daughter Bessie married Morris Cantor and Zalmen Shimson married Leiba Bryna Cantor. So there was many ties between the Schwartzberg and Cantor families. Morris was Leiba Bryna's nephew (son of her brother Mordechai) and his wife Bessie was a niece of Zalmen Shimson Schwartzberg (daughter of his brother Abba Velve).] Be sure to check on the Cantor connections both on this site and the Uzpaliai site.