Hi, my DS is 3 years and 4 months and very bright. I am separated from his dad and although he sees him he refuses to co-parent and share strategies. Fortunately I have fantastic family who also run the nursery my DS attends while I am at work full time and they back me up. My DS is very loud and talks non stop. He is also very volatile, sometimes I can anticipate a trigger for a tantrum but often they just come out of nowhere. If I challenge his behaviour he either screams at me or throws himself on the floor, cries or turns from me in a hump. He has also started being unkind and a bit rough with his cousin - she is the same age. This is totally unacceptable behaviour and I could really use some advice to nip it in the bud. The majority of the time he is a brilliant funny and loving little man but his bad behaviour is becoming more frequent and more of a problem - please help?