There was a slight error in my previous message. The mother of Carl Adolph Froelich was Carolina Dorothea Brandtin (and not just Dorothea). I have found the marriage of Carl Wilhelm Froelich and Carolina Brandtin on 1st September 1799 in Berlin. They were both in domestic service. Carolina's father, Adolph Brandt, was a fisherman from Fuerstenberg (then in Mecklenberg). It is possible that Carl Wilhelm Froelich was previously married to Dorothea Friederica Rauthen. A Wilhelm Friederich Froelich was Christened in Berlin on 17th August1791 - parentsCarl Wilhelm Froelich and a Dorothea Friederica Rauthen.