In no one does sin exist for God exists in all He has created and there is no sin in Him, and nothing lives outside of His Creation. You are the teller of a story about pain and suffering. You are not the character within the story who seems to suffer. There is a light in you that, when seen, will change the purpose of your story and the course the world will follow. The light in you is the Love of God and it is seen when you bring it wherever it seems missing. You were created as the extension of the Love of God. Without you love does not exist. With you love is all there is. How you experience this for yourself depends on accepting it is also true about your brother.