Marriage can go up in smoke when couples divorce, when they are no longer together. They can break apart those ties. But the same doesn't go for siblings. No matter how bad or how rough or how tough things get, a sibling cannot turn to their brother or sister and say, "You're not my sibling any more!" They can't end the fact that they're siblings; they cannot break the tie. Siblings are inseparable, no matter how hard they try. Sure, siblings can part ways and stop talking to each other. They can fight and they can be sworn enemies. But they're still siblings, no matter what. Even if their parents break up and remarry, nothing done from any party can possibly change the fact that they're still connected, still biologically siblings. Thus, I am inclined to believe that the bond between siblings is indestructible, stronger than even that of marriage.