At some point in the past decade I picked up "Christopher Hart's Portable Animation Studio".
It's not simply three blank flipbooks and an HB pencil. It mostly is.
The 50 page booklet turns out to be a decent little primer (for a grade school kid with a drawing habit). The artwork is the typical unattractive "cartoon" style, but a 12 year old could do worse.
And I just wanted to post a funny picture of Murray the Cat.