Re: My family don't like my being a musician....
I am, for a rare change, being completely honest right now.
F*** them. This is what makes you happy, this is what you are passionate about. Tell them that... if they aren't happy for you, or at least respectful of you and your career, then seriously... repeat my first two words of this paragraph.
Regardless of what society tells you, your family is just another group of people who you can choose to love or ignore. If they persist in bringing you down, make them the latter.