Spouses have each other, and even when one eventually dies,...

Spouses have each other, and even when one eventually dies, they have memories of a time when they existed before that other person and can more readily imagine a life without them. Likewise, parents may have other children to be concerned with--a future to protect for them. To lose a sibling is to lose the one person with whom one shares a lifelong bond that is meant to continue on into the future.