Jack Knabe was my Grandfather. he was born in pennsylvannia in 1884. He died in 1965.He was married three times. Two times to a Marie and finally my Grandmother Margaret Mathew Cross.I remember hearing them say that letters had been dropped off the knabe name, not really sure I heard the whole name when I was a kid.He had a son named Robert knabe who had 4 girls.I have been in touch with Donna who lives in California.We are also related to the Knabe Piano some how. Any information would be helpful.