Henry Calvin Henderson's middle name is not "Calvin" as noted on his head stone. His real middle name is "Callis", but because he HATED the name "Callis" he had the middle name of Calvin put on his head stone. The head stone was created for both he and his wife and before he died so he had what he wanted carved into the stone. I am his nephew, my father is his youngest brother (Rex Hartley Henderson). My name is Gary Odell Henderson.