should i dropkick my kid brother for going into the garage?

Like others have said it's a good chance to make a great experience out it.

My old brother was painting his 66 charger back in '76. He came home one day to find his 9 year old brother (yours truly) squatting on the roof working on basketball size patch of bare metal with handful of 80 grit sandpaper. The car was already blocked and ready. He describes a similar conflict of feelings.