i had exactly teh same issue with DS.
he would fart arse around, play with toys not do as he was asked get the poops when asked to ride to school after begging us to let him ride.
wouldnt get dressed or daudled getting dressed and would be late.
i set a time that the door opens and he is to leave for school if he hasnt eaten or gotten dressed he goes to school in his pj's
this happened twice and after teh embaressement of getting out of the car in his pj's he got the picture that i wasnt joking about it all.
i had his uniform in teh car but he didnt know that.
and with breaky there is no choice, its weet-bix and thats it. i dont do the whole what do u feel like. and if he hasnt had a glass of milk and done a number 2 every day he dont get to play or anything till he is ready to walk out that door. ( the number 2 thing comes from him wetting the bed due to holding on to his poo and him being impacted and it pushing his bladder)
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