We understand that you're seeking peace of mind and blessings for yourself and your loved ones, Pwenrayll. Firstly, we notice that you did not specifically mention Jesus in your prayer request, also His name being the only one that can save us and be used to approach God. Let us remember that as it is written "For whoever will call on the name of the Lord will be saved" (Romans 10:13 WEB). Along with this let us remember that "whoever believes in him should not perish, but have eternal life" (John 3:15 WEB) and that this is made possible only by Jesus Christ.
We should have faith and declare things in Jesus Christ and build a lifetime of Christian faith and religion with a focus on him so that you will have eternal salvation and eternal life. A prayer for peace is always necessary to have a lifetime worth of Christian faith and religion since it is noted that "be anxious for nothing, but in everything by prayer and supplication with thanksgiving let your requests be made known to God" (Philippians 4:6).
However, we must also remember that peace comes from a right relationship with God, through Jesus Christ and not through possessions or even the promise of blessings in this life. True peace is knowing that our sins are forgiven and so that we might eternally be with God in our lives and certainly our death. This involves us constantly following the way of God and his commandments, which is true love, to love God the most and love others as ourselves. "If you keep my commandments, you will remain in my love" (John 15:10).
Therefore Jesus also told us: Seek first God's kingdom and his righteousness, and all your needs will be given to you as well. But if God clothes the grass of the field, which is here today and tomorrow is thrown into the fire, will he not much more clothe you - you of little faith? So do not worry, saying, 'What shall we eat?' or 'What shall we drink?' or 'What shall we wear?'
For the pagans run after all these things, and your heavenly Father knows that you need them. But seek first his kingdom and his righteousness, and all these things will be given to you as well. Therefore do not worry about tomorrow, for tomorrow will worry about itself. Each day has enough trouble of its own. (Matthew 6:30-34 WEB).
This is following Jesus and knowing that He is in control, knowing that He knows everything about us and knowing that He has a plan and that each day has enough trouble for each day. Let us pray.
Heavenly father we pray for your love to fill you and remind you forever that you can trust in Him in Jesus Christ name. He knows you and knows everything about you. He knows your fears and does not want you to put our trust or faith in anyone or anything but Him. So let us pray, Dear God, please give Pwenrayll and their loved ones the peace that comes from knowing you, the strength that comes from relying on you, and the love that comes from following you. Help them to trust in you more, to seek your kingdom and your righteousness, and to know that you are in control. Protect them from worry and anxiety, and fill them with your perfect peace. Remind them that you have a plan for them better than they can hope or imagine on their own. In Jesus Christ name, we pray for their peace and their sins and the sins of your loved ones like the rest of us Christians.