Well, for us, neither parent is "unschooling" because we are not doing anything to our dc. They do what they do and we do what we do, each of us and altogether. Clear as mud, right?
Our situation presently is that I am home all of the time, and I'm working on a commission (book illustration) and when that's done, non-commissioned artwork and writing (amongst a long list of other things- there's an unjobbing tribe that addresses that part). My dp has a very chaotic job schedule that means he works shifts around the clock with no pattern whatsoever. So, today, forinstance, he's leaving at 3pm and will return around 1am, leave again at 7am and be home around 4:30pm tomorrow. Then he's home for five days straight, works odd shifts around the clock for another six days, has a few days off, and on and on.
We have no childcare and no family. One of us is home all the time, or we're out together. This summer, we have markets to attend, and our dc will be with us- whether my dp is at his job or not, I will be there with our dc.
It's very hectic in some ways, and in others, like when we don't worry about how we don't do really anything at "normal" times, it's just the way it is. There's a flow to the days and to feel well, that flow has to have the space of a week to even everything out; a flow that takes place over the course of just a day would be too fast and stressful for us. It's a lot like our diet. It evens out over a week rather than each day.
I agree that if there were one adult and a need for childcare, it would have to be a carefully selected person whose ideology matched the way we trust ourselves and one another to live our best lives. Given that, though I really don't see any reason it wouldn't work out just as well with one adult who works in or out of home. For me, the whole point is that we (as in all humans) are able to enact and capable of living our best lives. However that looks is how it looks, and is. It won't be the same for everyone. It won't likely even be the same for long for each family/person.
It has taken a lot of effort to remove layers upon layers of strictures from our life, though, to be in a position that allows us to mostly just live the way we want to (which is still part of a journey toward a goal, as in we have not arrived, but are just beginning now. It took long to get to the starting place). It has taken a lot of values-structuring and hierarchy determination. We couldn't have lived the way do now, five years ago. It would have been impossible. We had to journey to where we are to live the way we do. But that was an important part of the journey for us, and while it may now be invisible to my dc, it certainly wasn't and isn't to dp and me. For us, it took a lot of work and determination.