Far From the Tree, a book about what the author calls 'horizontal identities', which are identities that in many cases are not shared between parents and children and are often learned from outside communities, as when children are born deaf or with dwarfism or transgender, or who go on to become criminals.

That's a fascinating way of bringing together a concept. I'm now wondering whether they've dealt with the experiences of immigrants and religious converts, which I guess are the two main ways that I've experienced horizontal identities.