English

grandpaternity

From grand- + paternity.

Middle English

Proto-Indo-European *ph₂tḗr ‘father’

…

Latin pater ‘father’

Latin paternus ‘of or pertaining to a father, paternal’

Latin paternitās

Middle French paternité

Today it means

noun The condition of being a grandparent

Language periods are conventional ranges, not dates for this word.

Etymograph / grandpaternity