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plural grandnieces
A granddaughter of one's sibling; a daughter of one's nephew or niece. (Brother's granddaughter: fraternal grandniece. Sister's granddaughter: sororal grandniece.) quotations examples
Then come […] the Duchess’s grandnieces Zwile and her little sister Gloria.
2022, NoViolet Bulawayo, Glory, Chatto & Windus, page 209