Everyone seems to want you to argue but personally I think that's a bad idea. If it were me I your situation I'd actually avoid arguing altogether. I figure while you are still young and at the mercy of your parents you'll be better off playing down the entire situation. I imagine the more you argue and try to 'win' the situation the more they will push you. I have a feeling they would get tired of trying to force you if you don't react to what they are doing.
That said I've never been in you're situation nor do I know these people so I haven't really got anything to go on.
That said I've never been in you're situation nor do I know these people so I haven't really got anything to go on.