Thats fantastic! In my life it was the other way around. My dad used to sharpen his and the knives of his co-workers. All on what I grew up knowing as a whetrock. Medium/fine. I was about 9-10 years old when he said its time for you to learn how to sharpen a knife, boy. He had about a half dozen knives from work and had me sharpen them all freehand. All the work was done on the medium side then jack it up with light pressure on the fine side to remove the burr.
When one of his co-workers would ask him to sharpen their knife he would ask them, " Do you want to open cardboard boxes or shave the hair on your arm and impress your friends?" If it was open boxes he would give it what he called a working edge.
My dad is gone and I sure miss him alot. He was my mentor/buddy. Sometimes I think he forgot more than I'll ever know...but I don't give myself enough credit. Cherish your time with your father!