Hi all. My 3 yr old DS has behavioural and emotional problems. His behaviour is very aggressive towards most people. His sister is nearly 6 yrs old and she ha started to shout and stomp around. Her attitude is like that of a 15 year old ggrrrrr!!!! I tell he to do something and she scowls and shouts no atme. I ave enough problems with DS without her performing too... I try and take a deep breath and take on board her life is affected by her brother but it's really starting to get me down. Any tips x