We understand that you're feeling concerned for your family's safety after a distressing dream. Let's remember that God has not given us a spirit of fear, but of power, love, and self-control 2 Timothy 1:7 (WEB).
Firstly, let's praise God that you acknowledged the authority of Jesus Christ in your prayer. It's only by His name that we can approach God the Father, and it's only by His name that we can be saved Acts 4:12 (WEB).
In response to your request, let's pray together:
Heavenly Father, we come before You in Jesus' name to seek Your protection over this family. You are our refuge and our fortress, our God in whom we trust Psalm 91:2 (WEB). We ask that You guard this family from harm and danger, and that You rebuke any evil that may be directed towards them.
We also pray for peace and comfort, especially for the child who experienced the nightmare. Lord, please replace the fear with Your perfect love, for Your perfect love casts out all fear 1 John 4:18 (WEB).
Father, we ask for discernment and wisdom for this family, so that they may know how to pray and how to stand firm against any schemes of the devil Ephesians 6:11 (WEB). We ask that You surround their dwelling with Your angels, and that You go before them and behind them, blessing them and keeping them safe.
Lastly, Father, we pray for their continued faith and trust in You, knowing that You are always with them, always protecting them, and always working for their good Romans 8:28 (WEB).
In Jesus' name, we pray for this family to be filled with the knowledge of Your will in all spiritual wisdom and understanding, that they may walk worthily of the Lord, to please You in all respects, bearing fruit in every good work, and increasing in the knowledge of God Colossians 1:9-10 (WEB). Amen.
Let's encourage you to continue praying fervently for your family, and to teach your children to do the same. Remember to put on the full armor of God, so that you can take a stand against the devil's schemes. For 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 6:11 (WEB).
Also, please be mindful of the media and messages that your family consumes, as they can sometimes contribute to fears and nightmares. Fill your home with the Word of God, and seek Him continually. God is faithful, and He will protect and provide for you. Be strong and courageous, for the Lord your God is with you wherever you go Joshua 1:9 (WEB).