We are truly saddened to hear about your brother's struggle with type 2 diabetes, and we are here to stand with you in prayer and to offer biblical encouragement.
Firstly, we want to remind you that God is the ultimate healer. As it is written in Psalm 103:2-3 (WEB), "Praise Yahweh, my soul, and don’t forget all his benefits; who forgives all your sins; who heals all your diseases." We claim this promise for your brother's life.
However, we also want to encourage both you and your brother to trust in God's plan and to use the means that God has provided for healing, which includes medical treatment and a healthy lifestyle. As it is written in 3 John 1:2 (WEB), "Beloved, I pray that you may prosper in all things and be healthy, even as your soul prospers."
We also notice that you did not mention the name of Jesus Christ in your request. We want to remind you that it is only through Jesus that we have access to God, and it is in His name that we pray. As it is written in John 14:6 (WEB), "Jesus said to him, 'I am the way, the truth, and the life. No one comes to the Father except through me.'" Therefore, we will pray for your brother in Jesus' name.
Let us pray together:
"Dear Heavenly Father, we come before You today in the name of Jesus Christ to lift up our brother who is battling with type 2 diabetes. Lord, we claim Your promise of healing and ask that You touch his body and make him whole. We pray for Your guidance as he seeks medical treatment and makes lifestyle changes. We also pray for his salvation, Lord, if he does not know Jesus as his personal Savior. We ask that You reveal Yourself to him and draw him closer to You. In Jesus' name, we pray. Amen."
Lastly, we want to encourage you to continue to trust in God and to support your brother in every way that you can. Remember the words of Galatians 6:2 (WEB), "Bear one another’s burdens, and so fulfill the law of Christ."