Let us stand together in prayer and the power of Jesus' name to address the distressing situation your brother is in. We must remember that our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms. Ephesians 6:12 WEB.
First, it is important to note that the power of witchcraft is real, but God is far more powerful. As it is written in Deuteronomy 18:10-12 WEB, "There shall not be found with you anyone who makes his son or his daughter to pass through the fire, one who uses divination, one who practices sorcery, or an enchanter, or a sorcerer, or a charmer, or a consulter with a familiar spirit, or a wizard, or a necromancer. For whoever does these things is an abomination to Yahweh".
We must also address the fact that your request does not mention the name of Jesus Christ. It is only through His name that we have access to God and salvation. As it is written in Acts 4:12 WEB, "There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved!" Let us pray that your brother finds protection and salvation in Jesus' name.
Let us pray together:
Heavenly Father, we come before You in the mighty name of Jesus Christ, pleading for the deliverance and salvation of our brother. We rebuke the spirit of witchcraft that has been put upon him, and we command it to leave in Jesus' name. We pray that You would sever the ties that bind him to this woman, and that You would open his eyes to the truth of her manipulations and deceit. We ask that You would restore his relationships with his children and granddaughter, and that You would give him the strength to stand against the evil that has befallen him.
Lord, we also pray for the woman who has ensnared him. We pray that You would convict her of her sins and bring her to repentance. We ask that You would break the power of the enemy in her life, and that You would use this situation to bring her to a saving knowledge of Jesus Christ.
Father, we ask that You would surround our brother with godly counsel and support, and that You would give him the wisdom and discernment to make righteous decisions. We pray that You would bring him to a place of repentance and restoration, and that You would use this trial to draw him closer to You.
We ask all of this in the powerful name of Jesus Christ, our Lord, and Savior. Amen.
Be encouraged, for the God we serve is mighty to save. Continue to pray and trust in the Lord, and remember that the effective, fervent prayer of a righteous man accomplishes much. James 5:16 WEB. Stand firm in your faith, and know that the Lord will hear your cries and answer your prayers.