sibling, theirs Example Sentence:

In extreme cases, they may greet siblings as strangers and struggle to discern which child is theirs at school pick-up time.

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Related: sibling, theirs

Prev: We may not be the model parent, sibling, spouse, or friend but it’s not too late to start over.

Next: The study, published online in April in the journal Memory and Cognition, found that the "wrong" name is not random but is invariably fished out from the same relationship pond: children, siblings, friends.