My 3 year old step-daughter is just awful she refuses to do anything she is asked and spends the weekends we have her screaming and trying to get her own way and have her daddy to herself, I am at my wits end she has upset my 2 eldest sons (12 and 8 years) to the point they spend all there time when she is at our house in their room or outside as they are fed up of her trying to trip em up, spitting at them saying horrid things and screaming in their faces, she tripped my oldest and he bruised all his forearm as he stopped himself falling through a glass door and she just laughs.The whole t