Geise Families

My g-g grandmother came to America 1865-1866 from Oldenburg, Germany. She would spend the remaining years of her life in Quincy, Illinois. I have reason to believe that her father was, Johann Heinrich August Geise (b. 1806). In Quincy, Illinois, I have found a lifetime trail of Heinrich Arnold Geise (b. 1809) who I believe to be the brother of Johann Heinrich August Geise. My g-g-grandmother, Catharina Maria Anna (known as Mary) Geise (Ambros Zehnle) past away in 1912. In her obituary it states that she was survived by her husband, seven sons and one daughter. Also surviving, were brothers, Henry, Bernard, Fredrich, all living in the United States and JOSEPH GEISE of Oldenburg. No mention of her parents was made.
Does anyone have knowledge of this family or how I would be able to track them in Oldenburg (Borringhausen, near Damme).
Thank you for any help you may offer.

Sue Rybar