Grandfather
Defined in 3 dictionaries — Bouvier (1914), Black's (1910), Black's (1891)
Bouvier's Law Dictionary and Concise Encyclopedia
John Bouvier; revised by Francis Rawle · 1914
The father of one’s father or mother. The father’s father is called the paternal grandfather; the mother’s father is the maternal grandfather.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
The father of either of one's parents.
A Dictionary of Law
Henry Campbell Black · 1891
The father of either of one’s parents.