@OutOfControlSpirals (did I manage to tag you?)
Thank you for your answers.
On sibling conflict: yes, I guess that's pretty much what I'm doing with my lot. There are moments, though, like if I'm trying to drive and WW3 starts up in the back, when I will just shout "everybody SHUT UP UNTIL WE GET THERE OR I WILL CRASH". That's not very radical unschooler-y, but it does mean that (with luck) I don't kill everyone on the way to
On food: I used to worry so much about limited diets (sensory issues in the mix, too). The things that helped were remembering that it's really not a good look to force someone to eat something, and (a Sonrise tip) if I offered the same simple food day after day, without expectation or response whether they tried it or not, in the end they would, and they'd probably decide they liked it, and woohoo, that's a non-beige food that works its way into the standard diet. I've seen children go from frighteningly selective eaters to being willing to eat all sorts of new foods, and requesting them, too, when they are developmentally ready for it.
There is a challenge around the whole "children in charge of the shopping list" thing, at a stage where their desires for particular foods is at odds with the parental desire for different foods, or with parental budget, and the children can't process "there isn't enough money for that". Then it DOES end up as a straight, top down "no". I could never reconcile that with my unschool-y principles, because in the end I wasn't going to buy 14 jars of caviar (I just made that example up. I have never bought caviar in my life).
I think unschoolers quite often get muddled up with people who just don't bother to parent. It's probably one reason why I have stepped right away from aspiring to define myself as a radical unschooler, because I so often don't like what I see from families who claim to be part of that philosophy.