Do you have to love your sibling?

We’re often told we have a special responsibility to our brothers and sisters just because they are family. But, do we really? And what kind of duty is it?  What if you found out the annoying new kid at school was your long lost brother or sister?  Would you feel any differently about them? And, if you really didn’t like them, is it somehow worse to kill a sibling than to kill anyone else? Yep, some murderously tricky questions!