So, I am soon to be a step mum and my step daughter's behaviour is REALLY bad. The other kids are fine, but she is just so naughty. Today she had a meltdown because she didn't get sweets at 9pm (At bed time), and then ran off down the road at 9pm because her Dad said she couldn't have the sweets. How do you deal with this type of behaviour?it's like nothing I've ever seen before and is happening every time she is round (apparently she is doing it at home as well)