I had tried to teach him a few times in the past, but this summer, one of his day camps featured classes in Fiber Arts. He learned how to knit and purl, and used some of my leftover yarn to practice. I was shocked by how quickly he became comfortable with the motion and by how even his stitches are. He whizzed through a washcloth (see how diabolical I am? extra incentive to actually use the washcloth while bathing), not even batting an eyelash at the garter stitch edging, and started a hat:

This is some yarn I dyed and he asked if he could use it. The hat is nearly ready for the decreases and I have no doubt he'll manage those easily. I'm trying to convince him to go halvies with me on a sweater for him: I'll do the front and back if he does the sleeves...

