Donna is the daughter of Donnetta.
Donnetta is the granddaughter of Donnetta's sister, Donnita. Donnita has never met Donna. Donnetta is the _______ of Donna's mother.
Found in the Mindstretch Calendar by Terry Stickels
(In reply to
re: That is not what the first sentence says by Peter Lunts)
The first sentence says that Donnetta is Donna's mother. So the word that would work in the blank is name.