Framily

Hello, Everyone.
I'm writing a reference book on the linguistics of unofficially adopting adults into the family, and how there is no language to describe these adjunct family members. I'm hoping to compose a linguistic tree that will cover those friends who are close enough to be family.
If anyone has any insights to offer, or stories to tell me about adopted family members, please feel free to contact me.
javadavis@live.com