I'm sorry to say but the idea of unconditional love, whether towards "family" or towards friends is rather... Weak.
Caring for humans in general is very different than unconditional love and I feel is more what you're aiming at. It's the idea of no one(or at least many people)
really wants to see someone else to die or be hurt. But that's very different from unconditionally loving them and simply being related by blood or being loved by the other person does not instantly mean you must feel the same towards them. If this were the case you'd essentially be saying a stalker is someone you should love.
We choose to love, or rather acknowledge, those who we feel are worth the time. That's going to be different for everyone. I for one am on the side that blood means little to nothing. I keep my family members in my life because of who they are as people not because they birthed or raised me, if they ever change in a way that I find displeasing, yes I will "disown" them.
Love is earned, not simply given.