Trientje's sister was Greta Catharina Heyen Bruns born 12 Sept 1863 and died Oct 1930 in Iowa. She married Siebelt William Schuler after his first wife died. They had a son named Henry Schuler who was born 7 Aug 1893 in Wright County, Iowa.

Please let me know if this matches up to any of your information. I have been successful in finding most of Trientje's family since my original post. I have not located Trientje & Greta's brother Luitjen Evers Bruns yet.