Although she doesn't say many words (even though she can be very noisy!), Meredith understands everything that's going on, and so Charlie takes time during their play together to teach her everything he knows.
They built a fort out of couch cushions and set up beds inside. He's trying to get her to sleep on the bed and tells her to close her eyes. Standing up, she covers her eyes with her hands. "No, Mere!" Charlie says, frustrated. "Not like hide 'n seek. Close eyes like sleepin'!" She does as she's told. They "sleep" for about three seconds, pop up and proceed to destroy the fort, giggling while doing so.
They play so well together, these two, and I really think that Charlie enjoys having someone to show off all his knowledge to.