grandnephew ( synonym found)
Definition of grandnephew:

°Grandson of one's brother (fraternal grandnephew) or sister (sororal grandnephew), son of one's nephew or niece, one's sibling's child's male child.
Definition of grandnephew:

°Grandson of one's brother (fraternal grandnephew) or sister (sororal grandnephew), son of one's nephew or niece, one's sibling's child's male child.
Back to Top