"You don't do that to my sister!" Callum bellows at a boy on the playground, who'd just made Anya cry. (To be fair, she was going slowly down a tubular slide, and he'd had no idea she was there when he started sliding down.)
"He didn't do anything!" Anya protests, saving Callum from unjust punishment, even while blubbering about an upset that we thought Callum was responsible for.
"And one for Anya?" Callum always asks when we give him a treat.
It's nice to see that no matter how much they annoy each other, Anya and Callum do look after each other as well.