This little 6 year old needs professional help and fast. He is certainly NOT too young to recieve this. This is the time to intervene and get this behaviour under control. Imagine this when he is a teenager. This is a little boy who needs extrememly consistent parenting. Whatever method you choose you need to stick to for a long period of time before deciding it isn't working. People often give up a method after a couple weeks but remember, this didn't start in a couple weeks so it won't be fixed in a few weeks either. This level of violence isn't within "normal" so regular behaviour techniques may not be all that are needed. Professional help for the caregivers in terms of strategies and counselling for him are really essential to helping this little boy. Please readdress the issue of professional help with his dad and see your doctor -- they can often direct you to resources available in the community. Best of luck.
