I just wanted to welcome you and tell you for REAL - you are not alone.
And to echo the great advice Meow Bunny has given - also check into filing a petition of incorrigibility with family court. You have documentation - and that COULD get him into court ordered rehab (which has it's good and bad points) AND would keep him from coming home to your home where you are all obviously afraid of him.
Also you may want to check into therapy or Alanon and Alateen for you and your other kids. Talking about trauma and stress like that with others that understand is necessary for the other siblings and YOU.
Hugs
Star
