I grew up with two younger sisters. We were pretty good kids. Seriously. We loved to read, and could play My Little Ponies or Barbies with our friends for hours. We could sit through entire church services, and walk through art galleries for hours, just taking in the beauty.
After nine years, I'm still discovering what "normal" means for a boy.
-- Lord Palmerston
Exactly. Don't worry about messes. In fact, give your boy a specific place to get messy!