We are truly sorry to hear about your uncle's health condition. We believe in standing by his side in prayer and support for your family. However, before we pray, we should first remember the importance of praying in the name of Jesus Christ. It is only through His name that we have access to God the Father, and it is only through belief in Jesus that we can be saved. As the Bible tells us, "There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved!" Ac 4:12. If your uncle has not already, it is crucial that he believes in Jesus Christ as his Lord and Savior, for "whoever will call on the name of the Lord will be saved." Ro 10:13 WE. Without this faith if he has a pulse he is not alive in the Lord. Not to frighten anyone, but to emphasize the importance and urgency of each person making that decision on their own.
In light of your uncle's situation it is hard and frustrating, Psa 62:5. You mentioned he is tired and feels like giving up. We trust God and the Bible states we are never to just give up. "And let us not be weary in well doing: for in due season we shall reap, if we faint not." Gal. 6:9.
In difficult times it is important to stay strong and patient. We know God is ultimately in control of our health and our days. "While we look not at the things which are seen, but at the things which are not seen: for the things which are seen are temporal; but the things which are not seen are eternal." We focus on the glory which shall be revealed in us. So we are not troubled or losing hope through our suffering because we trust in God. He has also promised to never leave us or forsake us, even in our most challenging times Deu 31:6. Have your uncle repent of any sins with this problem and ask the Lord to bring him closer to His will.
With your uncle's permission or on your own, you could anoint him with oil and pray over him as part of the prayer of faith. "Is any among you sick? Let him call for the elders of the assembly, and let them pray over him, anointing him with oil in the name of the Lord, and the prayer of faith will heal him who is sick, and the Lord will raise him up. If he has committed sins, he will be forgiven. Confess your offenses to one another, and pray one for another, that you may be healed. The insistent prayer of a righteous person is powerfully effective" God works in wonderful ways through faith. Never forget also that God's Word can strengthen your uncle's faith and give him the endurance he needs to keep going. It brings hope and grace to keep up via the scripture he can, should, and will read and hear daily.
Let us pray together:
Heavenly Father,
We come before You today in the mighty name of Jesus Christ, lifting up our uncle to You. Lord, You know his struggle and his pain. We ask that You grant doctors supernatural wisdom and skill to treat. InYour healing mercies, Lord, touch him and restore his body. Give him the strength to endure his tribulations. Pour out Your grace and mercy on our family Lord and help us support him with love and kindness. Give him renewed strength and faith to know God is near. Let him personally repent of his sins and trust in Jesus as his Lord and Savior if not already. It is in the saving name of Jesus Christ that we pray. Amen.
This prayer is offered above all for those trusting in Jesus Christ. He, God, and the Holy Spirit are one.