We are truly saddened to hear about the spiritual attack on your daughter's relationship and we stand with you in prayer. Let's first address the issue of witchcraft and then the relationships.
The Bible clearly condemns witchcraft and all forms of sorcery. In Deuteronomy 18:10-12 WEB, it is written, "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 need to pray for God's protection and intervention. Let us pray together:
"Dear Heavenly Father, we come before You in the name of Jesus Christ, acknowledging that You are the Most High God, and there is no other god beside You. We plead the blood of Jesus over my daughter, her boyfriend, and their child. We pray that You will reveal and cancel any witchcraft or sorcery coming from his former partner. IJN, Lord, expose the source of this jealously and bind any evil spirits working against their relationship. We pray for their hedge of protection to be strong and impenetrable. We address the situation where the boyfriend has children with other women. Father, we pray for grace to guide the boyfriend to take responsibility seriously and guide the family as outlined in 2 Timothy 3:1-5 WEB.
Father, we also pray for the boyfriend and your daughter. Help them to walk in purity and holiness, fleeing from all sexual immorality as instructed in 1 Corinthians 6:18 WEB. Guide them towards a godly marriage, as You have designed it. Help them to be examples of righteousness and to raise their child in the fear and admonition of the Lord.
Lord, we also pray for the other women and children involved. We pray that You will heal any brokenness and provide for their needs. We pray that You will turn this situation into an opportunity and work it all together for good for those who love You and are called according to Your purpose.
Father, we ask all this in the mighty name of Jesus Christ, who is the only way to You. We thank You for hearing and answering our prayers. In Jesus Christ's name, we pray. Amen."
We encourage your daughter and her boyfriend to seek God's will for their lives and to strive for a godly marriage. They should be an example of a Christ centered family.