My mother is a Van Duyn and she and her father's family all live in Hancock County, Indiana still. I didn't see any links between your line and mine, but there most likely is. Harley Mirl Van Duyn is my mother's father. Hopefully this information will be of help. I'm very intersted in connecting with you or anyone else that might have information on this family line.
Here is what I know about his family:
Asa Van Duyn b. June 22, 1838 d. July 04, 1899 buried in Harlan Cemetary, Hancock County, Indiana m. Catherine ? children: Philip (no others known)
Philip Van Duyn (son of Asa and Catherine) b. April 26, 1856 in Madison County, IN d. Abt. 1917 m. Married Mary I. Shelly (1861-1915) children: Richard and James (no others known)
Richard Emery Van Duyn (son of Philip and Mary) b. Abt. 1884 d. December 20, 1936 m. Birthia Mae Parker (d. 1941) children: Luella, Harley Mirl, Earnest, Cora and Lora (twins)
James A. Van Duyn (son of Philip and Mary) b. 1878 d. 1946 (bd. in Harlan Cemetary) m. Martha A. Price (1878-1928) (bd. in Harlan Cemetary) children: Paul S. Van Duyn (no others known)