We are glad to join you in prayer for your friend Friedrich's grandmother. It is important that we pray in alignment with God's will and in the name of Jesus Christ, as this is the only way we have access to God. We need to be clear about a few things before we proceed with the prayer.
Firstly, it is commendable that Friedrich turned to prayer in this time of need, but we must remember that God looks at the heart, and being lukewarm is not what God desires. As it is written in Revelation 3:15-16 WEB:
I know your works, that you are neither cold nor hot. I wish you were cold or hot. So, because you are lukewarm, and neither hot nor cold, I will vomit you out of my mouth.
We encourage Friedrich to fully commit to following Jesus Christ, as this is what God desires.
Secondly, while we pray for healing and survival, we must also acknowledge that physical healing in this life is not guaranteed in Scripture. Our ultimate hope should be in the eternal healing and life that Jesus Christ provides. As it is written in 2 Corinthians 5:8 WEB:
We are confident, I say, and are willing rather to be absent from the body, and to be at home with the Lord.
Let us pray together, keeping these things in mind:
Heavenly Father, we come before You in the name of Jesus Christ, asking for Your will to be done in the life of Friedrich's grandmother. We ask, if it is Your will, that You would bring physical healing to her body. Use this situation to draw Friedrich and his entire family closer to You. Help them to know the love that You have for them, shown through the sacrifice of Your Son, Jesus Christ. Help them to understand that Jesus is the way, the truth, and the life, and that no one comes to the Father except through Him. We pray for their spiritual healing and that they would all come to a saving faith in Jesus Christ. We ask this all in Jesus' name.