When I ask M to say goodnight to his brother he says:
Everytime M starts a puzzle, J will crawl up and M will say:
"Stop...stop...stop...You need to learn to stop."
Every morning when M see's his brother he says in his sweet morning voice:
" Hey J, that's your baby brodder J....good morning J."
It's a not so vicious cycle; one that I love being a part of.