We are truly sorry to hear about your brother-in-law's health condition. Let us come together in prayer and seek God's will for his healing and comfort for the family.
Firstly, we want to remind you of God's promises for healing and health. In Exodus 15:26, God says, I am Yahweh who heals you. Also, in 3 John 1:2, Beloved, I pray that you may prosper in all things and be healthy, even as your soul prospers. God cares about our physical health, and we can trust Him with your brother-in-law's situation.
However, we must also remember that our ultimate hope should be in Jesus Christ and His salvation. Although we pray for physical healing, we also know that God's ways are higher than our ways, and His thoughts higher than our thoughts, as it is written in Isaiah 55:8-9. We need to submit to God and trust that He is working for the good of those who love Him, who are called according to his purpose, as stated in Romans 8:28. We are praying that your brother-in-law can accept Jesus as his Lord and Savior if he has not done so already.
Let us pray together:
Heavenly Father, we come before you in the name of Jesus,
The guest's brother-in-law is very sick and needs your healing touch. You know his body and you know the struggles he has had and will have. Lord, if it is in your will, please heal him from this heart problem, remove the blocks in his lungs, increase his blood cell count, and take away the swelling in his legs. Guide the doctors' hands and let the injection work without any complications or internal bleeding. Lord, he still has a purpose here on earth as a father to his younger son who is preparing for his exams.
Lord, we also pray for the family, give them your peace that surpasses all understanding. Comfort them and help them to trust in you. Be with the younger son as he prepares for his exams, give him a calm heart and a sharp mind to remember what he has studied and to apply it successfully.
We ask all of this in the mighty name of Jesus Christ, our Lord, and Savior.
Also, let us encourage you to continue praying and believing in God's goodness. Remember that even in difficult times, God is with us and will never leave us nor forsake us, as stated in Hebrews 13:5. Keep trusting in Him, and He will see you through this challenging time. We pray for your brother-in-law's faith in Jesus.
Lastly, we want to remind you that the fear of the Lord is the beginning of wisdom, and the knowledge of the Holy One is understanding. We are praying for your brother-in-law through Christ who strengthens us. Continue to pray with us. There is no other name by which you can be saved and thus gain control of the Holy Spirit. We are praying for your brother-in-law's repentance and salvation in the name of Jesus and your faith in Jesus.
Prayer Focus: God, Thank You. Thank You for loving me. God, I ask You in Jesus’ name bless me with everything that I stand in need of and everything You want me to have. Bless me to know You in truth, fall in love with You with all my heart, mind, soul, body, and strength and never fall out of love with You. Bless me to have an ever growing closer stronger, more intimate relationship with You. Bless me with the love, desire, strength, and the spirit of obedience to always delight myself in You, seek first Your kingdom, and Your righteousness. Help and strengthen me God to always respect and obey You. Bless me to trust You with all my heart, acknowledge You in all my ways, and lean not to my own understanding. 
