No pictures because I thought it would be creepy, but I was sitting at the practice courts in Cincy today and Mark Knowles came up with his older son Graham (who is six or seven I think) and was hitting around with him. It was really cute, his son had a junior version of dad's racquet and he was having a lot of fun
Mark had to keep telling him which service box to stand in and at one point, Mark said to him "Graham, what are you doing with your arms, remember how I taught you, show me your two handed backhand!"
After his son hit it one-handed again, Mark was like "Two hands!" and his son went "Dad, look, I use one handed backhands, okay?"
Very cute moment.