• grand-child (obsolete)

From grand- +‎ child.

• Audio (Southern England):

  (file)

grandchild (plural grandchildren)

1. A child of someone's child.
   • 1912, Willa Cather, The Bohemian Girl::

     ...he fell into amazement when he thought of the Herculean labours those fifteen pairs of hands had performed: of the cows they had milked, the butter they had made, the gardens they had planted, the children and grandchildren they had tended, the brooms they had worn out, the mountains of food they had cooked. It made him dizzy.

   • 2020 September 27, Stella Chan, Paul Vercammen, Artemis Moshtaghian and Amir Vera, “NFL legend Joe Montana tussles with woman who attempted to kidnap his grandchild, police say”, in CNN‎^[1]:

     Legendary NFL quarterback Joe Montana and his wife confronted a woman suspected of trying to kidnap their grandchild Saturday, according to the Los Angeles County Sheriff’s Department.

   • 2022 May 17, Esha Mitra and Jessie Yeung, “Indian couple sue only son for not giving them grandchildren”, in CNN‎^[2]:

     A couple in India are suing their son and daughter-in-law – for not giving them grandchildren after six years of marriage.

• grandbairn (Tyneside)
• grandkid (informal)
• grandoffspring
• grandwean (Scotland)
• oe

• (antonym(s) of “with regard to ancestry”): grandparent

• granddaughter
• grandson
• maternal grandchild
• paternal grandchild