Talk:Religion/@comment-27873114-20180430144001/@comment-4010415-20180501061057

To be honest, you don't actually have to be biologically related to refer to someone as a family member. Since they were the only two beings in the universe, they could've just considered each other to be brothers, especially if they came into being around the same time.

I know that the whole "We're not actually related, but I consider you family" thing most often tends to happen with close friends of your parents being referred to as your aunts and uncles and, by extension, their children being referred to as your cousins. However, some people come to consider a close friend to be a brother or a sister. One of my coworkers calls one of her friends her brother, despite there being zero biological relation. Another example off the top of my head is that the members of BTS (a Korean pop group) refer to each other with the word "hyung", meaning "older brother".