I am looking for descendants of Johan Heinrich Oltmanns and Anna Margaret Bentjen, both in the US and Germany. These are the parents of my maternal grandfather (also Johan Heinrich or John Henry, known to us as "Henry"), who was born in Edewecht in 1888. Johan died prior to 1899, and Anna married a man with the surname Tapken. They emigrated to the state of Nebraska in the US with several of Anna's children from her first marriage. Some of her older children remained in Germany, and at least one daughter who came to the US later returned to Germany.