Yes, Just, just the slightest of smiles.

When my grandchildren act up, even now my daughter will say to me, even though I have the most benign expression on my face, "You're laughing aren't you?" I say, "Sweetheart, I'm not laughing at you, I'm laughing with you."
For an absolutely hilarious stand-up about the trials of bringing up kids, try and find a copy of "Bill Cosby: Himself". When my hubby and I saw that, years ago, we litterally fell off the sofa laughing. I mean we really fell off!! It will make your day.