I can really relate to this
my father committed suicide when I was 12. I was extremely aggressive smoked a lot of pot for most of my teens, terrible to my mother at times. I've spent most of my life feeling like my anger was a curse. Destroyed a lot of relationships because I could not control myself. My mother took her life just 3 years ago. I felt like that angry child again, this time destroying my relationship with my wife and ultimately my family left. Now with to parents committing suicide and a broken family, I was left pondering suicide. Depression and anxiety are now symptoms I have to manage on a daily basis. Through therapy and my own life plan (structure) I'm living a life that keeps on improving.
The child is angry because they hurt. Their father was taken from them and it was out of their control. To be angry is to feel in control, it feels powerful as aposed to being sad and vulnerable. I was trying to control every person, every situation in my life. If I could not control it, I got angry. It is really important the child speaks with someone to understand the feelings associated with suicide. Not just anyone though. If they don't get some good information early into counselling they will turn their back on it (as I did.)
It is really important that the child does not feel isolated (which right now I'm think is a huge probability) everything they are doing and feeling is normal. There are so many of us out there that can completely relate. A support group I've used among others is support after suicide.
I could talk all day as this is so close to my heart. These children will be in my thoughts. I wish I could reach out and help them