Noun
A daughter of one's grandson or granddaughter.
Source: Webster's dictionarygreat granddaughter
Gowers (1951), p. 9 In her biography of Gowers, his granddaughter Ann Scott uses the form "Gowers' room"; in the extensive biographical sketch that prefaces the 2014 edition of Plain Words, his great-granddaughter Rebecca Gowers uses "Gowers's room". Source: Internet
As her great-granddaughter, Michelle Duster, told the Chicago Tribune, “the only thing she really had was the truth.” Source: Internet
And yes, I think your mom hung on long enough for her great-granddaughter to be born. Source: Internet
'Every day is a gift,' says Doris Lerner Schwartz, 102, especially if it includes her 2-1/2 year old great-granddaughter. Source: Internet
“My great-grandmother will now be remembered for the woman she was and the contributions she made to our country,” said Michelle Duster, Wells’ great-granddaughter. Source: Internet
He is also survived by six grandchildren, Roxann (Jeff) Stewart, Blake Werner, Sean Smith, Alexis Werner, Marieanna McVey and Tejia Smith; also one great-granddaughter, Elie Stewart. Source: Internet