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
Donnetta is the grandneice of Donna's mother.
Donita is Donetta's sister. That means that her daughter - X is Donetta's neice (daughter of her sister). That means that Donetta is her own grandneice.