I also have the anger. It is always just below the surface waiting to explode at a moments notice. I am married with 3 kids and while I may not have combat PTSD I have about as close as you can get without being in combat. I have learned that my wife will remind me if my anger is getting out of hand. It sounds dumb but at the first signs of it she will point out that I am getting angry and ask me if I need to think about it first. I will admit when she first started doing that it increased my anger by a large margin ( thinking to myself that she was just trying to get out of being yelled at ) but after seeking help I now realize she was just trying to make me see if my anger was justified. And if the anger was justified that I needed to tone it down a whole lot and try explaining myself a bit calmer.
Also for myself I have a service dog as well that helps with my PTSD. She is trained to help me with panic attacks and flashbacks but she also will literally jump on me if my voice is raised in anger as if trying to remind me in the way my wife does, "Hey knock it off Dad, relax, think before you speak." The combination of my wife and the dog has helped me a great deal.
Having kids and anger issues don't work too well but there are ways to do it. Just think of the things you did as a kid and remember that they are going to do the same exact things you did. The instant anger can be controlled you just need to learn what works for you. Also if you are not already trying seeking therapy. They will be able to teach you new techniques for controlling your anger that you may have never thought of before.
I am not sure if my comments here helped but I wish you well.
