Three months ago we let our six year old be in charge of setting up the whole bathroom for brushing. He picks which cup, which toothpaste, and lays out both brushes. That tiny bit of control flipped a switch. He stopped arguing because he helped make the plan. It turned a power struggle into a shared job, and now he even reminds me if I skip a step. Giving them a real role in the routine, not just a game, made our evenings way calmer.
Yeah the "real role in the routine" part is so true. I read something similar about choice theory, how even small choices make kids way more likely to cooperate without a fight.