Anita and Dieter--
Is the Name Roebken a form of Roeben? I have Roebken (Roepken) families in Lintel/Hude 1660's - 1760's, by name of Gerd Roebken (in 3 generations) and daughter Metta Roebken (m. Hinrich Schroeder 11.5.1751. Would they appear in your database?
Hugo Schroeder