Calw Weinmanns

I'm searching for Weinmanns with a connection to Calw Germany, a village between Baden Baden and Stutgart. My great grandmother Katharina Weinmann left Calw for America September 1881. With her was my grandfather Mathias (or Matthew) Weinmann - born abt. 1867, his (older?) brother John, and possibly a sister named Margaret. There may have also been another sister.