A birthday sonata

I don't actually know what constitutes a sonata. As we celebrated Daddy's birthday with the Knudsens—in between Will's birthday parties—the kids serenaded us at the piano. From the photos, maybe you would agree it was a sonata. From the audio, chances are less likely.
A little pre-present snuggle. Or an Ellie sandwich. ;) Anyone else think Will and Andy look like carbon copies here?
Maybe not so much a sonata... dueling pianists?
Heart and Soul?
If you're a candle-counter, Daddy is not 7. Nor is he 43. ;)
May those birthday wishes come true!