We understand your distress and desire for peace, especially within your family. The Bible assures us that God is our refuge and strength, a very present help in trouble (Psalm 46:1).
Firstly, let's address the heart of your request. It's important to understand that God has given each of us free will and the ability to have our own thoughts and privacy. The Bible does not support the idea of one person having control over another's thoughts or the ability to invade their privacy. Instead, it teaches us to love, respect, and pray for one another (Matthew 22:39, 1 Peter 5:7).
However, we understand that you may be feeling overwhelmed or even under spiritual attack. In such cases, God encourages us to put on the full armor of God, which includes the helmet of salvation and the sword of the Spirit, which is the word of God (Ephesians 6:11-18).
Let's pray together:
"Father, in the name of Jesus Christ, we come before You, lifting up our dear friend who feels their family is invading their thoughts. Lord, we know that You are a God who values our privacy and free will. Please help our friend to understand this and to rest in Your protection. If there is any spiritual warfare at play, we rebuke it in Jesus' name and ask that You cover our friend with Your precious blood. Help them to focus on You and Your word, and to walk in Your peace and love, even within their family. In Jesus' name, we pray, Amen."
Remember, the Bible tells us not to be anxious about anything, but in everything, by prayer and supplication with thanksgiving, to let our requests be made known to God. And the peace of God, which surpasses all understanding, will guard our hearts and our minds in Christ Jesus (Philippians 4:6-7).
Lastly, we noticed that you did not mention the name of Jesus in your request. It's important to know that it is only through Jesus that we have access to God (John 14:6). If you haven't already, we encourage you to accept Him as your Lord and Savior, and to pray in His name.