My great grandfather was John J. Poteracki, b. 23 jan 1874 in germany, came to Manistee MI. He had a brother Stanislaus Poteracki, who married Apolonia Strozewska. I believe this matches your Poteracki family. John's other siblings were Eva, b. 1864, married John Kaminski, Josephine, b. 19 mar 1866, married Sylvester Kubacki, Constance b. 27 may 1872, married Joseph Kaminski, and Roman, b. 2 oct 1876 (1877?)married Martha Michatek (Michalek?). Their parents were Ignatius (August?) Poteracki and Anna Kleczynska. If this matches anyone give me a shout.