Incest Survivors Support Group
Incest refers to any sexual activity between closely related persons that is illegal or socially taboo. Consensual adult incest is very rare. Incest between adults and prepubescent or adolescent children is a form of child sexual abuse that has been shown to be one of the most extreme forms of childhood trauma. If you or a loved one is a survivor of incest, join the group...

But who knows if even the perfect retribution would heal us.
Dragonfly's advice is very powerful and I am going to practice it too:
" I have a saying I am practicing - be joyful in the present moment. In my present, I do not live with an abuser and I do not have to spend any time with an abuser." Thank you!
I keep a pic of my dad in a drawer and every once in a while I'll look at tit. For me, I use it as a "gauge". I focus on what emotions I'm having as I look at it and that in turn allows me to see what areas that may still need some healing.
I know you're probably also wondering if there were others too then just you and that boy. I know there were many others that my dad messed up. "Normal" people/society can quickly dismiss these questions and move on, we don't have that luxury. We're almost bound to the questions to find the answers or come to some sort of understanding. Perhaps to find a solution. Still it drive us bonkers.
Each to their own. If looking at it helps you in some way then do it. Do what ever you want, but don't forget to look after yourself.
hugs