C should never board with B, and B should never board with A. Anybody who tries this should be slapped down and publicly shamed. Even my dog could figure out the grouping. I suspect there are many who pretend "they don't understand". That should not be tolerated.

Addendum: no lack of boarding order enforcement on todays flight, but ridiculous number of “families” including parents with zero small children. I guess this is WNs way of ensuring they don’t get DOT co
plaints about separating parents and kids.