is this legal

Matthew is a huge helper and has been cleaning this week. I never seem to get enough time to get all I want done, so I enlisted his help this week cleaning the mirrors and windows. He loves spraying windex for me and even uses the paper towel a little to wipe it off. Then the other night he pushed the kitchen chair over to the sink and said "I wash dishes" So here's a picture of my little worker bee getting our house back together. Is he too young? I figure later in life it will be a fight to have him help, so enjoy it while it lasts. Next, scrubbing the floors, haha.