I am looking for information on Jelte Mammenga, his father Thys Mammenga, and family from this line. I believe they came from Ostfriesland Germany in or about 1880-1882. Via New York (although I have never found them on a ship list) to Illinois to Minnesota, Redwood Cty. Waterbury township. They are buried at St Matthew Cemetery outside of Wabasso, Mn. Mickey