According to ship passenger manifest list at Ellis Island, NYC, Lewis Silbert indicated that he was enroute to his brother-in-law, S. Cooper, of Harrisburg, PA.67
1900 US Census listed Simon Cooper (same address as on the L. Silbert immigration list) was married to Sarah (?). Hence, Sarah was probably Louis’s sister.
Yr immigrated = 188918
1910 US Census: Res. 600 North Street, Harrisburg, Dauphin Co, PA; NARA Series: T624  Roll: 1336  Page: 273
1920 US Census: Res. 1925 Second St., Harrisburg, Dauphin Co, PA; NARA Series: T625  Roll: 1559  Page: 172