Dear Susan Nass: I want to thank you for your efforts. I should have alerted this forum that I have found my father's birth family. I simply wrote all the Vassars in Minnesota that I located on Facebook. After about six months of waiting, one of the women I reached out to revealed herself to be the wife of one of my father's cousins by birth. She put me in touch with my dad's still-living elder brother and sister. I've seen photographs of my dad's mom. I finally know who I resemble in the family. Facebook, for all its annoyances, was a godsend in this regard!