Smile or grimace?

Was asked by daughter if I could look after grandson this afternoon whilst she went to work for a couple of hours.

Well what can you say? Sorry I work as well? No, it's not convenient? Of course not! So flexed off work and enjoyed several hours with grandson walking around local country park. I don't know who was more tired, me or him!

Took this photo when he was starting to get tired, hence not sure if smile or grimace !