That's a loaded question... In our experience so far, it's been the kids who are the worst offenders for making it difficult to keep the server kid friendly. We wanted to be as anti censorship as we could, but kids can be assholes to one another, so we're having to clamp down on it. So you might have to define "kid friendly", because right now that seems like the kids themselves would define it as letting them cuss each other out, sling racial slurs at one another, spawn kill each other, and break all of each other's builds as much as they like. Kids are not kid friendly.

I would say that our survival world is pretty kid friendly, depending on how old your kid is, and how used to the mechanic of losing your stuff when you die he/she is, which is a normal mechanic in Minecraft. There is PVP on the survival world, but most people are chill and don't just randomly kill people. If anyone starts being antagonistic about it, we put a stop to it.

Sataria is our nations server and it is designed to be for the more mature, who understand there is a high likelihood someone is going to shank them and take their stuff if they are wandering around in the wilderness. It is for those who want to do a bit of role-playing/lore building for building up nations, allying with other nations, resolving conflicts diplomatically, or possibly going to war.