Mastodon Feed
some highlights:
1. a "family" can contain only 2 adults. or at least, you can have a bunch of adults, but the first 2 adults are special and they are the only ones that can share "content" (books)
2. any account created with an email address is an "adult"
3. a "child profile" family member remains a "child" forever. you must supply an accurate birthday but when they turn 13, they're still restricted as if they're under 12