This morning DS2 (2yrs) pulled an entire shelf of books off the bookshelf. We've only just moved here and I'd just finished their bookshelf yesterday.
DS1 (5yrs) came in and said 'Oh mate, look what you've done. You'll have to clean that up now. C'mon I'll help you'.
I just love how he is as a big brother. I then walked in on the two off them putting the books up on the shelf, so untidily mind you, but my heart warmed at the sight of them working as a team.