"Can't you two ...?"

Son 2 is home for a week.  I collected him from school first thing in the morning (Wife was still asleep) and we spent the day doing this and that.

Got home mid-afternoon and I said something to Wife that made her snap back at me and I snapped back at her.  Son 2 advised me sotto voce, "Don't say anything. Just don't respond."  I shut up.

Wife left the room and Son 2 asked, "Can't you two get through a single evening without fighting about something?"

I couldn't think of something suitable to say, so I just stared out the window.  Son 2 finished the thought: "No, you can't. That's why you're leaving."

And then added, "This is why I love Durmstrang so much."