Obeek
When two people are so close they could be related and still no one would question it.
My cousin and I have been Obeek since we were 5. We still don't know who's the bigger loser.
They're Obeek. They even share the same stupid inside joke about the time they got kicked out of math class.
If you're Obeek with someone, you know their mom's phone password.
xs