Re: My family don't like my being a musician....
There's no argument like success. If you set goals, actively pursue them, and achieve them, your folks won't have a leg to stand on. If you can be happy and support yourself as a musician, they should support you. If they don't, that's their problem not yours.
If I may speculate, I would imagine their opposition has more to do with the religious aspects of this situation than the fact that you want to play music.
Usually it's the other way around--religious parents disapprove of their non-religious kid, but in either case, the parents' main concern should be the kid's happiness and security. Those often get overlooked because of ideological differences.