Is a father considered an apostate for his negligence in raising his children, to the extent that some of them embraced a disbelief (kufr) or committed an act of disbelief, and must he utter the Two Testimonies (Shahadatayn) anew if he wishes to repent, and is his negligence considered an acceptance of disbelief?

Neglecting the upbringing of children and failing to raise them upon righteousness is considered a grave betrayal of the trust and a great squandering of the divine commandment in His, the Almighty's, saying: "Allah instructs you concerning your children." Children are trusts that Allah has entrusted to parents to look after their religious and worldly interests, to teach and discipline them, to restrain them from corruption, and to command them to obey Allah, and His, the Almighty's, saying: "O you who have believed, protect yourselves and your families from a Fire whose fuel is people and stones." And children are a flock over whom Allah has appointed the father as a shepherd. And the Messenger of Allah, peace and blessings be upon him, said: "Any servant whom Allah has given charge over a flock, if he dies on the day he dies while being deceitful to his flock, Allah will forbid Paradise for him."

A parent's negligence in raising their children to the extent that they deviate into disbelief is not considered an approval of disbelief, but rather negligence, dereliction, and a betrayal of trust. He is sinful, but not a disbeliever or an apostate. If he wishes to repent, he must seek forgiveness, regret his negligence, and rectify what can be rectified.