Share 'unschooling other people's kids?'

A thread on facebook prompted me to wonder: can you unschool with a nanny? The "short answer" I'm pretty sure, is "yes" but I'm interested in discussing the nuances of that and other situations where unschooling is complicated by the addition of "extra parents". I'm a stepmom, so I've been through some complications with unschooling across a divorce, and I know there are families who rely on exte…