the prayer of abraham for the forgiveness of his father was only because of a promise he had promised him but when it had become clear unto him that he was an enemy to allah he disowned him. lo! abraham was soft of heart longsuffering.
وما كان استغفار إبراهيم لأبيه إلا عن موعدة وعدها إياه فلما تبين له أنه عدو لله تبرأ منه إن إبراهيم لأواه حليم