Singular
grandchild

Plural
grandchildren

  1. (countable) A grandchild is the grandson or granddaughter of someone. It is the child of someone's child.
    Jemima is my grandmother. She is my father's mother. I am her grandchild.
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Members of a family (edit)

parent: father - mother | spouse: husband - wife | child: son - daughter | sibling: brother - sister | uncle | aunt | nephew - niece | cousin | grandparent: grandfather - grandmother | grandchild: grandson - granddaughter