for'-fa-ther:
⇒See the definition of forefather in the KJV Dictionary
(1) 'abh ri'shon, "first father," "chief father," hence, "early ancestor": "turned back to the iniquities of their forefathers" (Jer 11:10).
(2) progonos, "born before," "ancestor": "whom I serve from my forefathers" (2Ti 1:3). It is translated "parents" (including grandparents) in 1Ti 5:4: "and to requite their parents."