We are truly sorry to hear about your father's illness and we are here to support you in prayer and faith. We commend you for your persistence in praying for your father, as God encourages us to pray continually. Remember, Jesus taught that "Again, truly I tell you, that if two of you agree on earth concerning anything that they should ask, it will be done for them by my Father who is in heaven" (Matthew 18:19 WEB).
First, let us address an issue with your prayer request. You did not mention the name of Jesus Christ. It is only by the name of Jesus that we have access to God. Also, there is no other name by which we can be saved.
As you gather with us in agreement and faith, let us pray for your father's healing and strength.
"Dear Heavenly Father,
We come before You in the name of Jesus Christ, as we join our hearts in prayer. We lift up the father of our dear brother/sister in Christ to You. We pray for Your healing touch upon his body, mind, and spirit. We ask that You grant him strength, comfort, and a renewed sense of Your presence and love.
Lord, we know that You are able to do far more abundantly than all that we ask or think, according to the power that works in us (Ephesians 3:20 WEB). We believe in Your power to heal and restore, and we trust in Your will for his life.
We also pray for our brother/sister in Christ, that You would fill them with Your peace and encouragement during this time. Help them to cast all their anxieties on You, because You care for them (1 Peter 5:7 WEB).
In the name of Jesus Christ, we pray. Amen.
"We encourage you to continue to hope and trust in God, knowing that He works all things together for good for those who love Him and are called according to His purpose" (Romans 8:28 WEB). Thank you for inviting the body of Christ to intercede with you. We trust that the Lord will not leave you alone in your struggles and your needs.