Can you hear?

It was a family Von Trapp moment. A little bit of guitar singing to finish off the meal. Sebastian really wanted to sing the tractor song. I searched my repertoire and pulled out several options, but none went 'driving on my tractor broom broom broom'. Perhaps (if you can possibly believe) there is a tractor song they are teaching at Kindy that I don't know? We were at a loss.

'Mummy, listen to my ear. Really close. Can you hear it?'

Alas, no I couldn't. See if Daddy can?