Sibling Love - sort of?

Scene: Wyatt in his booster seat munching on a couscous and tuna sandwich (I know!), Ava painting her nails at the coffee table (again, I know!).  Me in my kitchen, gazing lovingly at my clean counters.
Wyatt:  *loud sounds of complaint, followed by crying*
Me (enter stage left): What's going on with Wyatt?
Ava (barely looking up from her nails): Oh, he's just losing his mind.