noun
Usage: sometimes capitalized both Fs
1. : a family of high social rank or pretensions especially due to descent from the first settlers of a place
those few inhabitants of Boston who regard themselves as the … end-all American civilization — the thirty or forty first families — Katharine Rosin
— abbr. FF
2. : the family enjoying preeminent status in some place
the closest relatives of the young god-king automatically became the nation's first family — Heinrich Harrer