Your dad was a fine and interesting person who will be missed by so many people, partly due to his writing because the written word continues to 'speak' long after the writing ends.
We are sorry for your loss. it is pretty painful to become the 'older generation' in a family, yet life goes on, and blessings continue for Christian families. Memories, and the sharing of them is so special. What stories you must have of him and what joy to share them with your grandchildren as they grow up.