Is giving one's children firewood to a woman who uses it for smoking shisha, at the father's request, considered cooperation in sin, or is each person responsible for their own actions?

It is not permissible to give firewood to a woman who uses it as charcoal for smoking shisha, because this is considered assisting in sin. Allah Almighty says: "And cooperate in righteousness and piety, but do not cooperate in sin and aggression." Obedience to a parent or the woman's supplication does not justify forbidden assistance. Rather, one must apologize and explain the prohibition of shisha and its harms gently and wisely.