Car Seat or Arm Chair?

Getting Aiden in to his own car seat nowadays is usually preceded by a five minute wrestling match where he attempts to fling himself out of the seat and on to the driveway while we're trying to strap him in. But one day this week Avery's mom left her car seat at the house for dad to pick her up. I think that Aiden thought her car seat was his personal arm chair because he kept bringing books over and "reading" them while sitting in the chair. But he couldn't quite figure out how to scoot back so he sat seriously slouching!