Searching for relatives of Johannes Reinhold Kergel born in Bromberg, Prussia 1800?

Searching for descendants of Johannes Reinhold Kergel, who was born in Bromberg, Prussia. He married Elisabeth Bruski (polish). They had a daughter (my grandmother), whose name was Helene Anna Franziska. She married Erich Otto Scholz; together they had 2 children. Heinz Hans Erich Scholz born in Berlin 1930 and Vera Scholz.