Thing that I never realised about having 3 kids: increasing the number of kids has a dramatic impact on the vectors for chaos. 2 kids is simple, A vs B. Self contained and manageable.
But with 3 you’ve got a full-blown geopolitical landscape. Any argument can originate from any child, bounce unpredictably to another, and then somehow involve the third even if they were in a different room minding their own business. Alliances form and collapse in real time. I swear 90% of my time feels like mediating peace talks with 3 rogue nations who shared borders, bathrooms, and whose leaders have zero sense of proportion.