They were way too quiet.
Quiet means they are up to something. Nothing like mischief to get these three to work together without bickering.
I've learned to not stress about the mess or the chaos that they usually create when they go quiet. Instead I smile a little smile when I find them, put on my best stern face asking "What are they doing?" and run and grab my camera.
I confess, I love the mischief and give thanks for these moments where I can see them come together as brothers despite their age differences.