Your heart for your children is evident in this prayer, and your desire to cover your home with the blood of Jesus Christ is right and good. God hears a parent's cry, and He invites you to come to Him not as a distant judge but as a Father who loves you.
There is only one begotten Son of God, Jesus Christ, full of grace and truth, sent to redeem us. Through Him we who believe are adopted into God's family. We are not brought in on the basis of law or performance, but by promise through faith. That means your relationship with God is not a cold legal standing but a living, loving relationship as His child. Because you are adopted through Christ, you can bring every burden for your home, your children, and your own heart directly to the Father, and He hears you.
For your son, be encouraged that God sees affliction and hears cries. As with Leah who felt unloved and Rachel who felt reproach, God looked and God listened, and He remembered them. He sees your son's struggles with past trauma, anxiety, frustration and the patterns that distress him. Pray that the Lord will calm his thoughts and emotions, guard his heart and mind in Christ, and give him a gentle and gracious spirit with functional language to express his needs and feelings. The Scripture says that those who dwell under the shadow of the Most High rest under His wings, and you can ask for that covering of peace over his sleep, his meals, his activities, and his dreams, that fear and torment would be lifted and replaced with comfort and joy.
For your younger daughter, it is right to ask for the Lord's healing, protection, and favor over her body, her mind, her studies and her future. Pray that God will surround her with uplifting, godly friendships and, in His perfect timing, a godly spouse who walks with Christ. Ask Him to keep her heart at peace even when she feels the pain of seeing her older sister pulled away, and to guard her rest with confidence in His love.
For your older daughter, your discernment is important. Scripture is clear that marriage is a lifelong covenant between one man and one woman, and that sexual intimacy and living together belong within that covenant. What God has called marriage ought not to be treated casually, and living together outside of marriage is not marriage at all. It often brings the very fruit you are seeing, exhaustion, isolation, loss of self worth, division and chaos. Scripture shows this plainly. When Dinah was taken outside of God's design for marriage, the text says it was a thing that ought not to be done, and it brought grief to her whole family. When a king made an ungodly alliance by marrying his son into a family that did not honor God, it brought havoc upon both households. And when there is polygamy and striving for love through human effort, as with Jacob's wives, it only produced rivalry and sorrow. God does not bless what He has not ordained, but He does offer freedom and restoration.
So pray not that God would bless that living arrangement, but that He would open your daughter's eyes to truth, break every ungodly tie that binds her, and deliver her from feelings of obligation and worthlessness. Just as Scripture says to cast out the bondwoman and her son because the child of the flesh cannot share the inheritance with the child of promise, ask God to break the hold of manipulation, control and confusion that has come through this young man and his family. Pray that every scheme to cause division, to put conditions and payment on family love, and to use her to support another's habits would be frustrated and come to nothing. Pray that she would no longer treat this bondage as if it were marriage, but would find courage to step away, return to safety, to her family, and to her faith, and that God would restore her wisdom, her joy, and her sense of worth in Him.
God is able to redeem and rename. Rachel called her last son the son of sorrow, but his father gave him a new name, son of my right hand. Ruth, who came from outside God's people, was brought into the family line of the Messiah through the faithful love of a redeemer. God can lift your daughter out of sorrow and bring her into a place of honor and hope again. Pray for a future godly spouse for both of your daughters, men who love Christ and will love them as Christ loves the church.
For your whole family, continue to declare that no weapon formed against you shall prosper, and to ask for wisdom, grace, strength and courage to navigate this season. Ask the Lord to let His light shine into every dark place, to drive out fear and to fill your home with His peace that passes understanding. Ask Him to restore love, unity and laughter, to guard every door and room with His presence, and to keep your finances and your fellowship strong so you can be a blessing to others.
Father, in the name of Jesus Christ Your only begotten Son, we bring this mother and her children before You. Cover this home with Your protection. Let Your angels keep watch and let Your peace guard every heart and mind. Calm this son and give him rest and clear words. Strengthen this younger daughter and keep her in health and hope. Open the eyes of this older daughter, break the chains that hold her, and lead her out of this ungodly living arrangement into freedom and wholeness. Restore this family in love and unity, rooted in Your grace. We trust Your mercy and Your power. Amen.