We are truly saddened to hear about the painful situation your family is enduring. We will stand with you in prayer and offer some biblical guidance. We understand and this will be addressed as biblically appropriate.
Firstly, we acknowledge your comments about the abuse of your daughter. Abuse is sinful, harmful, and clearly against biblical principles. The Bible tells us that husbands are to love their wives just as Christ loved the church and gave himself up for her Ephesians 5:25 WEB. Marriage is a blessing and we must commit to each other in love. Anything outside of this does not align with God's will. We support properly (biblical) divorced individuals. Remarriage is only permissible if the divorce was on biblical grounds which includes sexual immorality. If your daughter was divorced for any other reason, remarriage is adultery according to Jesus in Matthew 5:32 WEB.
Now, it is crucial to pray for your son-in-law's salvation and transformation. As it is written in the scriptures, in 1 Timothy 2:1-4 WEB We ought to pray "for kings and all who are in high positions, that we may lead a quiet and peaceable life in all godliness and reverence. For this is good and acceptable in the sight of Elohim our Savior, who desires all people to be saved and come to full knowledge of the truth.
Let us pray together:
Father, we come before you in Jesus Christ name and for the name of Jesus Christ alone are we able to come to you. We ask that you intervene in this heart-wrenching situation. We pray for your grace to help your daughter avoid adultery and be a living sanctified Christian. We pray for your daughter's healing and restoration, that she may be restored from her past hurts and abuses to her Christian faith and love. Turn her heart to you. We ask that you work in her ex-husband’s heart, that you be able to convince him to turn to you, the only living God, and that due to your change of heart in him that he stop his campaign to destroy their children's relationship with their mother. We know that through the power of Jesus Christ, no weapon formed will prosper. Isaiah 54:17 WEB. Protect these children through your will and they come to the knowledge of your salvation through your son Christ Jesus, Father God. Turn the hearts of the children to their Christ initiated and commanded properly biblical living and restored mother through your Holy Spirit Elohim. Hear our prayers, and let your will be done. God, your ways are higher than our ways, we trust your way is the best way. Not our will, but your will be done. Thank you, Father, for hearing our prayers. We ask this all in the name of your son Jesus Christ.
Lastly, we encourage you to stand firm in your faith. As bad as it may seem you have to remember that God is in control and all things work together for the good of those who love the Lord in your life. Everything that we experience in life is to grow us and make us look more like Christ. Do not give up praying for your daughter, son-in-law. Build and nurture your bond with your daughter and grandchildren as the Lord leads you to do. Continue to push towards fellowship with them and be a living example of Christ’s love.
Again, your forgiveness and reconciliation to Jesus Christ is available through salvation if you admit you are a sinner, believe in your heart in him, and declare your belief in him to others as described in Romans 10:9.
Articles:
Amen, Joseph! Standing firm in God's power. "Greater is He that is in us than he that is in the world" (1 John 4:4). Trusting Jesus' authority, we command any lingering spirits to leave. "Resist the devil, and he will flee" (James 4:7). United in prayer, believing for complete deliverance! "At the name of Jesus every knee shall bow" (Phil 2:10). Keep praying, warriors! 
Joseph Gelli:
's heart. "If you declare with your mouth, 'Jesus is Lord,' and believe in your heart that God raised him from the dead, you will be saved" (Rom 10:9). Keep praying for her salvation and deliverance. "Believe in the Lord Jesus, and you will be saved" (Acts 16:31). In Jesus' name! 
