Niece's knees

I am far too proud of the little joke I made last night. But that never stopped me before.
I curl on Tuesday nights this season. Our lead is from Scotland, and still has much of the accent to prove it. At one point he turned to our skip, who is having issues with his knees, and asked, "How's your knees?" It sounded vaguely like 'kneese'.
So I said, "Why are you asking about his niece?"
The Scotsman seemed to ponder what I asked for a moment, then looked over at me like, ha, ha, very funny.
Well, clever more than funny. In my opinion.