Answer: granddaddy

AnswerCrossword Clue
GRANDDADDYFirst of its kind
GRANDDADDYOld man with two pairs?
GRANDDADDYPop's pop, informally
GRANDDADDY"The ... of 'em all"
GRANDDADDYPop's pappy
GRANDDADDYPop's pop
GRANDDADDYPa's pa
granddaddya grandfather also GRANDADDY
granddaddyUsed to denote a person or thing that is considered to be the best, largest, or most notable of a particular kind