salam.
Ramdhan Greetings Akhi,
well first of all you know Akhi Music is not allowed in Islam i sugess you tell you mam && papa to sort them out also explain to them that on Day Of Judgement Allah will punish them soo bad that you will regret, sit down && respectfully explain to them inshallah, Make Du3'ah that Allah Subhanawatallah leads them to the right path && shines thy light upon them.
also would like to say as there your younger brothers why not hid the Tape/H-Fi from them && give them a lecture but i know what you mean they will get in one ear && out of the other, also Akhi it's not ONLY your bro's whom listen to stuff like that, my OWN Brothers whom are christains listen to stuff like this also my sep papa whom is a muslim listens to stuff that is soo filthy!! ASTAGFIRULLAH!! MAy Allah lead them to the right path inshallah (amin Thumma amin)
do more Dawah inshallah
w.salam