What happened was: they became a team, a family of two. There had been times before they ran away when they acted like a team, but those were very different from like a team. Becoming a team didn't mean the end of their arguments. But it did mean that the arguments became a part of the adventure, became discussions not threats. To an outsider the arguments would appear to be the same because feeling like part of a team is something that happens invisibly. You might call it . You could even call it . And it is very rarely, indeed, that it happens to two people at the same time-- especially a brother and a sister who had always spent more time with activities than they had with each other.