Does anyone claim him or know more of his ancestry?
Per census, Sidney's father was b. NJ Sidney b NY ~1818; married Catharine S. ____ b. Baden/Germany; he died around 1900, probably in Rochester.
Family appears in Rochester, NY censuses 1850 through 1910, sometimes living with BANKS in-laws. (Sidney was probably not b. in Rochester.)
Sidney + Catharine children: John H., William, Clara, Mary, Amelia, Frank
In CA, Clara married Stephen NELSON (b. VT) and apparently died there. Mary married a NEWSOM. Amelia married George W. BANKS. William seems to have ended up in Buffalo, Erie, NY after 1900.
This Sidney is probably not the son of Azariah of Horseheads. Azariah's Sidney is still living with his parents in 1850, while my Sidney already had a wife and three children living in Gates/Rochester, Monroe, NY.