|  | 
Definition of Grandniece
1. Noun. A daughter of your niece or nephew. 
Definition of Grandniece
1. n. The granddaughter of one's brother or sister.
Definition of Grandniece
1. [n -S]
|  | 
1. Noun. A daughter of your niece or nephew. 
1. n. The granddaughter of one's brother or sister.
1. [n -S]