Is this my 4-year old or my mom lecturing me?!

This, yesterday evening:

Me:  Sweeties, can you please clean up your room before you go to bed?  (looking around at the plentiful Star Wars action figures, the TinkerToys, the Matchbox cars, and other plastic creatures that cluttered the rug of their room)

H:  Relaaaaax, Mommy.  

Me:  Huh??  (Surprised, as I had never been told before to "Relax" from either of the kids)

H:  Mommy, we're just kids -  you've got to let us be kids.  Kids are supposed to have messy rooms because we like to play.