Yep. That's the exasperating part. Not their fault of course, but difficult to navigate in the course of everyday life and trying to keep things running smoothly.

ETA - what you have added about your interactions with your brother gives me food for thought actually. My eldest does often feel my youngest has spoilt it by being sensitive, even when it is the actions of my eldest that has interrupted things. It's a lot like the dynamic you describe sometimes.