Emergency Custody question?

I found out today that my sister passed away. She had 7 children, 2 of the 7 from different men. I am not worried about the 5 she has with her husband as he is a great father and will take care of them. The ones I am most worried about is the 14 year old (his father is in prison and there is no family to take care if him at the moment) and the 5 month old baby - from what I have heard he is an alcoholic, violent drug user. He currently has the baby with him. I live in San Jose and she lives in Oroville CA which is about 2 hours from me. I am planning on going to Oroville on Tuesday to go to the courts and am hoping to get the baby and the 14 year old so I can raise them as my own. Can I get an emergency custody hearing for the baby? What paperwork do I need to file? I am so distraught at the moment and all I can think about is that poor little baby, it's making me sick to my stomach. I made a promise to my sister that if anything ever happened to her I would raise her children. Any information would be greatly appreciated. I plan on coming home on Tuesday with my niece and nephew.