Please help.......I have nearly 4 year old twins, and a 6 year old. My eldest is such a sweet, loving child, with the odd behavioural challenge but nothing unmanageable. One twin can be particularly defiant with my DH, wilful and a bit of a diva, but again fairly typical behaviour, within reason, for her age group. However the other twin I ask advice about is outrageously naughty. She has scratched my eldest, so hard that she has a permanent scar on her forehead. She regularly scratches, bites and pinches her twin sister. The other twin is no saint, but nowhere in her league either. She is outright defiant with me or my DH a lot of the time. Has no problem shouting and screaming at us in public, or at home. Can stop dead in her tracks, I've never seen stubbornness on the same scale. She was caught drawing on the kitchen floor tiles earlier, and then deliberately knocked over a beaker of milk a couple of hours later. I'm at my wits end, exhausted with the daily battle, sad and perhaps a little defeated for the impact it us having on us as a family, and believe it or not, I'm no pushover either. Her list of misbehaviours is endless, and I've honestly never known anything quite like it. She's made me question my parenting skills, so please help with tips, suggestions etc on how we can achieve a more harmonious home.