We don't really have meltdowns but definitely assertive stubborness lol. DD1 (4) is at a stage where she is needing more control over herself and her situations. Is there room to give him more control over things? What would have happened if when you suggested it was time to get up and he wasn't keen, you just left him and said okay, well I need to get going on stuff you can join me when you're ready? That seems to work with DD, she usually does whatever I have asked pretty quick as soon as she gets to decide the 'when'. Or with the teeth brushing, can he have his turn separately? And then work on him using more effective ways to request those sort of things, like how to ask for space from your DD instead of trying to force it. I always tell DD1 I will be able to help her if she asks for help but that I will have to look out for DD2's safety first if she tries to enforce her wishes without consultation which will mean DD1 might miss out on whatever it is she wants/needs regarding the situation. I know DD1 definitely gets frustrated with DD2 getting all in her face sometimes so we have also set up a 'safe spot' where she can escape from her and have some space.