Hey Oz, I say while writing your story, to write it ALL out, warts and all. Then go back and create an EDITED version for your kids. (but keep the full version somewhere safe)
If you decide not to give them your life story now, maybe you can put it in your will, that when you pass away and your children are a certain age, for it to be released to them.
I personally would love to know my parents history - warts & all, however I am in my late 30's, I wouldn't want to have known it when I was a teenager.
Edited version for teenagers.
FULL version when they are adults.
Just my 2c.
Even if you don't give it to them, I think it will help you just by writing it.
I have no kids so I can not even imagine the pain you are going through!
3Mozzies