Charles Tucker I was the father of Charles Tucker II and grandfather of Charles Tucker III and Elizabeth Tucker. (ENT: "First Flight")
Tucker referred to his grandfather in the past tense in "First Flight", suggesting he was deceased at that point (2143). His father might be Cyrus.
Trip also stated that his grandfather saw the first transmissions from Terra Nova
as a child, sometime around 2078
, though it is unknown which grandfather he was talking about.