I hate my dad's g.f. n her stupid daughter!! how do i get rid of them!??! i need help!!?

give her a taste of her own medicine.That means whatever she is doing to annoy you do the same thing or smothing else to annoy her.or just talk to your dad about it,maybe he is not so whipped after all and will do something to make you and your other sibblings life better.goood luck on your mission!