Don't listen to them, they want what will bring you 'success' but they don't realize that a successful life is a happy life, not one of wealth :S! Most creative types would rather earn enough to get by but be doing what they love, than to be earning enough to go on glitsy holidays to get away from their horrible jobs and lives
grandparents and teachers are programmed to think that maths/science/business is going to guarantee a good career and money, but with the amount of people going to uni these days and trying to get jobs... it's just ridiculous :S
My friend wanted to do Art but her parents wouldn't let her follow her heart... the most creative thing they'd let her do was Architecture, which is a 7 year course! She's a year and a half through and is very near to dropping out. What's more, they're foreign so have to pay £10K a year! All wasted now...! Adults need to trust that what their kids have a passion for will make them happy, and that happiness is everything. Follow your dreams!