My MIL has the same thing going on at our Christmas gatherings in the background....but after a few beers all of us boys start in predicting the obvious predictable romances and the who's and what's next, that it can become fairly entertaining for us, maybe not so much for poor MIL, but I think she secretly gets a kick out it.
Now back on topic....sort of....saw a sweet Grand Waggy on some FBI drama recently. I hope it didn't get blown up.
Dude, that painted a very cool picture for me and I just had to say that I'll all but guarantee that your MIL absolutely LOVES it. Further, I bet you could win massive points and make her Christmas if you were to slip in a mention of how much fun you think this family tradition is. Just a thought.