My 3rd baby is due on Tuesday and my bump hurts so I am probably BVU. However, listened through the toilet wall as daddy got the 2 under 5 boys painting pictures in the kitchen. Sounded idyllic. Went in and one boy is happily painting thetable blue. Daddy is hanging the washing up in the corner with his back to them both 
he then complains when there are big blue paint stains on the chair covers. AIBU to think that you should supervise a messy activity, not just let small children get on with it by themselves?