I stumbled upon your posting while searching "Van Orsow" and noticed you were asking about John Van Orsow. I'm hoping it is the same person you were describing. You might have already got your questions answered considering the posting was from 2001. I have a John Van Orsow within my family tree. Here is some info...again you might already have it...
Name: John Nicholas Van Orsow
Birth: Aug. 26th 1915
Death: Oct. 20 1960
Birthplace: Walcott, Minnesota
Parents: Martin Van Orsow, Nellie Theodora (Donkers) Van Orsow
I also have: WWII Navy Veteran, start of service Aug. 25 1943 - Nov. 2 1945.
Burried at the Willamette National Cemetery, Portland, OR
Siblings: Irene Ernestine Van Orsow (April 28, 1918 in Minnesota - ?).
Joseph Martin Van Orsow (May 31, 1920 in Minnesota - March 22, 1988 in Boring, Oregon).
Theresa Marie Julia (Van Orsow) Stensrud (April 5, 1931 in Minnesota - March 13, 1984 in Hermiston, Oregon of Cancer)...my grandmother I never met.
Is there any more information you would like? I'm hoping this helped some...although it was a long time ago when you posted :)