We are so glad to join you in prayer for your dad's health and faith, as well as your mom's worry and her own health. It's wonderful that you brought your requests in Jesus Christ's name. Let's pray together:
Heavenly Father, we come before you in Jesus' name, lifting up our dear brother's dad to You. Lord, You are the Great Physician, and we ask that You touch his body, heal him, and restore his health. We pray that You will help him to feel Your presence, and to know that You have not left him, nor will You ever leave him or forsake him, as You promised in Hebrews 13:5. Strengthen his faith, Lord, and help him to trust in You even in this difficult time.
We also lift up our dear brother's mom, Lord. We ask that You will ease her worry and replace it with Your perfect peace that passes all understanding, as it says in Philippians 4:7. We pray for her health and a long life, Lord, and ask that You will fill her with Your strength and courage.
Father, we ask that You will work all things together for good in this situation, as You promised in Romans 8:28. We thank You that You are already doing so, and we trust Your will to be done. In Jesus' name, we pray. Amen.
We encourage you to continue praying fervently for your parents, as James 5:16 tells us that the effective, fervent prayer of a righteous man avails much. Keep trusting in God, and remember that He loves your parents even more than you do. He is always with them, and He will never leave them or forsake them.
In addition, encourage your dad to read Psalm 73:26, "My flesh and my heart fails, but God is the strength of my heart and my portion forever." Remind him that even when he feels weak, God is his strength and will always be with him. For your mom, share 1 Peter 5:7 with her, "casting all your anxieties on him, because he cares for you." Assure her that God knows her worries and cares for her.