What should I do with my brother who has abandoned prayer and watches what angers Allah, despite listening to admonitions, and whose heart has become hardened?

What your brother is doing—abandoning prayer and watching things that displease Allah—is forbidden. Abandoning prayer is an act of disbelief (kufr) that expels one from the fold of Islam, according to many scholars. Looking at forbidden images is a sin that necessitates repentance. We advise you to continue counseling your brother, reminding him of Allah and His punishment, and to seek help from influential books and tapes, and from relatives and friends who have an influence on him, so that perhaps Allah may guide him.