Assertion: grief's relationship | /r/CapableOf | sustain each other's identities
Facets:
Source sentences:
text: However, the sibling relationship tends to be the longest significant relationship of the lifespan and siblings who have been part of each other's lives since birth, such as twins, help form and sustain each other's identities; with the death of one sibling comes the loss of that part of the survivor's identity because “your identity is based on having them there.