Wiktionary
great-great-granddaughter
n. The daughter of one's great-grandchild.
Usage examples of "great-great-granddaughter".
One toddler, invited into the room as much as anything to remind Digna that her line was secure, was seven year old Iliana, great-great-granddaughter by Digna's oldest, Hector.
His great-great-granddaughter Zillah tarrieth yet in the house of their kinsman Habakkuk, she being content to extend her visit, and they to have her.