"I call the loss of a brother or sister the loss of a lifetime. Because who else do we expect to spend an entire lifetime alongside?" -Lynn L. Shattuck Those who lose a sister or brother to death are often referred to as "forgotten" or "invisible" mourners. But the impact of outliving a sibling is complex and long-lasting, stretching and morphing over the years. This collection of writing from 26 authors examines sibling loss from a number of unique perspectives, including dealing with the death of an estranged sibling, unpacking delayed grief, what it means to know your existence is inextricably tangled with a sister's death, and exploring signs and continuing bonds, while also validating common experiences among grieving siblings such as having our loss overlooked, a lack of resources and the impossibility of "getting over it." These stories affirm that the death of a brother or sister is a profound and life-altering loss-and that both love and grief can last a lifetime.