"Just a mom"

Conversation I had with Kyson while driving to the store:

Kyson: Mom, what do you want to be when you grow up?
Me: I am already grown up and I'm a mom.
Kyson: You're just a mom? That's not a job. Moms just clean and work all the time.
Me: That's all moms are good for?
Kyson: Ya! Maybe you should drive a tractor. You can drive a tractor AND be a mom!