Board Thread:Naruto Discussions/@comment-30881771-20170906144712/@comment-25122992-20170906145614

Well, bonds aren't necessary a blood relation as Naruto himself said. Of course, he's meant that other way around, but it could be also interpeted differently. Karin has never been a friend or a close associate of Naruto, she isn't even living in Konoha as for now, but stays with Orochimaru. It doesn't matter if Naruto knows about their relation or not, they've neve been close to each other and there's no reason for them to become close, each of them minds their own business.