Harry was my grandfather. He and his wife had only one son, Donald Vinton Knapp (1923 - 1971), who married V. Clarita Cranston (1922 - 2012) who later changed her name legally to Clarita Cranston Knapp. They had 4 daughters: Carol, married to Pastor Terry Mahnke, me, Kathryn Lucille, Donna, married to Steven Becker, and Bonnie. Six grandchildren followed and great-grandchildren number 2 so far with an addition expected next year. I have a tree on ancestry.c that is public and you are welcome to take a look It's called Knapp Family Tree.
We have pictures of Great-Grandma Addie Ann holding Carol and holding me.