My sister is doing her wedding soon but she chose to do it un-islamic with Music. I dont attend any weddings usually with these westernized mixed weddings but this time its my sister. I told her it should be islamic because why would anyone want to start a big chapter of there life with disobeying God and the wedding will just have no barakah. She of course didn't take my advice and got annoyed. I cant tell her I wont go because again, she is my sister. What should I do? I don't want to commit any sin listening to music by going to her wedding. What do the islamic laws order me to do? What do you recommend I do?

In such a situation, you can go to the wedding, greet her, take a gift and say Salam to the people present, and when the music/dancing starts, quietly leave the hall. She might still get upset, but upsetting her is better than violating Allah’s laws and giving your approval to haram acts through your presence. If she rebuked you, tell her that you broke Allah’s laws and you pushed me to do this, so don’t blame me. I love you as my sister by Allah comes before you.