My father, Lloyd Derflinger in Front Royal, says that he knows Wayne & Norman's sister, Doris Miller, (Warren County Treasurer). He says that we are related through their father but does not know exactly how. My grandfather was Walter Robert Derflinger (b.1906 - d.1978). My research and information from other researchers has lead me as far back as the 1700's for our direct ancestors. Jacob Dorflinger, our direct ancestor lived in Bucks County Pennsylvania, and Frederick County, Maryland during the 1700's. Jacob had a son, Johann (John) Jacob Derflinger, born 1773. Later comes Philip Derflinger who lived in Warren County in 1850's, he had a large family. From this family comes my great-grandfather George Derflinger.
I have not been able to go back further than Jacob with exact proof of relationship but I have some evidence that shows the earliest (1600-1700's)Derflinger's (Dorflinger) came from Blankenloch, & Baden Wuerttemberg, Germany.
I hope this helps you in some way.
Thanks for the tip about Derflinger's around the San Antonio area. Many German's settled in Texas and there are still communities of Germans in and around San Antonio.