You know all that sage advice about knowing what your kids are doing online and having open dialog so they'll tell you stuff. You know? That.
I've been trying so hard, but have to hang my head and confess to failure.
The thing is, my boys are in to Minecraft. It's a computer game apparently. And they love it. They do it for hours - on their own sometimes and with other kids whenever they can. If you can't find one of them, almost certainly he'll be doing (is that the right word) Minecraft on his computer or his iPhone.
In fact, they adore it so much they make videos about it that they put on YouTube. And so, apparently, do most of their friends. Don't tell them, but it's hard to imagine any more tedious content committed to YouTube.
But in pursuit of that much-vaunted dialogue, I keep asking them about Minecraft. What do they do? How does it work? Even - what the heck is it?
But when they speak I just hear a rumbly, squeaky kind of white noise. Sure one-by-one I recognize the words - vanilla, sandbox, horses - but put them together and they might as well be talking to me in Japanese.
Perhaps the same thing happens when I utter the words: "Go and tidy your bedroom." Because the look of utter bafflement is the same.
As far as I can see in Minecraft - which at £17.95 isn't a very expensive game, as these things go - you can build stuff. There's no shooting, no car chases and not even any fancy graphics. No sexiness and no subliminal advertising. There's no finish - winning or losing - and, as far as I can see, no real objective.
To be frank, it looks a bit rubbish. Like crude drawings of Lego and why would anyone do that?
Minecraft's own website says:
"Minecraft is a game about breaking and placing blocks. At first, people built structures to protect against nocturnal monsters, but as the game grew, players worked together to create wonderful, imaginative things.
"It can also be about adventuring with friends or watching the sunrise over a blocky ocean. It's pretty. Brave players battle terrible things in The Nether, which is more scary than pretty. You can also visit the land of mushrooms if it sounds more like your cup of tea.
"So far 10,336,387 people bought the PC/Mac version of the game."
So that's it then - it's computerised Lego without the price tag or the limitations with added monsters and some mushrooms.
Refreshing and unnerving in equal measure, Minecraft doesn't seem to do the same huge budget mass-marketing as other games. I have no idea how just about every young teenage child in the western world knows all about this... and wants to have a go at it, but it's a triumph of something.
As far as I can see, there's nothing much to object to about Minecraft - it's creative, co-operative, not apparently violent and the kids might even learn something. Maybe I'd feel differently if I understood it, though.