Hello Joyce! I too am descended from Friedrich & Catharina (Eck) Sachau (my 3rd great-grandparents) through their son Hans Jacob Sachau. My Sachau line (as far back as I have, with thanks to Ute Sachau whom you've seen on this forum) descends as follows:
Hinrich Zachau (b. abt 1717) m. Anna Behrens Hinrich Zachau m. Maria Haccius Friedrich Sachau m. Margaretha Holst Friedrich Sachau m. Catharina Eck Hans Jacob Sacau m. Wiebe Dethman John Gosch Sacau m. Minnie Jensen Dollie Sachau m. George Pautsch Janice Pautsch m. Edward Robertson-Evans ME!
Which of the children you have listed are you descended from?
Always glad to hear from a cousin, no matter how distant...