Today, I was sitting in a BBC radio studio in Berkshire, receiving texts from that same son, now all grown up and at work - though watching the tennis match on his computer - the game between World Number One Rafael Nadal and the young Spaniard, David Ferrer at the Australian Open, which was being played live during my programme!
"Aaah!" went one text. "Nadal has lost it! I think he's going to lose the match in straight sets!"
And then, a few minutes later: "Nadal is nearly crying. He must be injured...What's going on?"
Australia Day is bad luck for Rafa. Last year, on exactly the same day, he had to retire in the middle of his match against Andy Murray at exactly the same point in the championship.
It's sad for him - but possibly great news for Andy. Now he plays Ferrer on Friday morning. I'll be expecting more texts!