As others here have expressed our heart felt pain that you have for your brother, I too ask in Christ name his salvation.
May I suggest that you print out these post, put them in a small box and give them to him as a symbol of the Gift of Salvation, through the Crucifixion Death and Resurrection of our Lord Christ Jesus for our seperation from God which is was sin is.Thi may helphim come to see that salvation is a free gift paid for by Christ and given to any one that calls on His name. No works or religion or test or anything, just the accepting of Christ as the risen Son of God, the first born of the dead.
It is a way to show him, we here, wish to see him once we too have passed into Heaven and that we too wish to share the gift that no one can buy at any price, because the price for each has been paid, we need only accept what Christ has offered.
Please be in Peace and let the Holy Spirit comfort you and your brother
In Christ Name I pray.
Wyndham