What should I do if my parents are playing or listening to Haram music if I do not want to upset them or make them sad? And how should I deal with a situation where they decide that they want music at my wedding?
Bismillah
Thank you for your question. Enjoining the good and forbidden the evil is dependent on the effectiveness of your actions or words, not on whether the person will feel bad for a time, even if that be your own parents. Rather, what is important is to maintain respect and gentleness if you think your message will reach open ears.
As for playing haram music at your wedding you can state quite clearly that you would be opposed to that.
May you always be successful