You remind me of one of my best friends. Not just because of the abuse you endured, but because of the strength you have that has gotten you through it all.
Where I'm from, people like you are referred to as "dandelion children" -- kids who have had such a horrid childhood that there's no reason they should make it. And yet, you do. Like dandelions breaking through the pavement. You fight. You live. You love. And you keep on going.
There are oodles of researchers working on finding out why people like you, and like my friend, against all odds are able to fight their way through the harshest conditions and find a way to thrive when people with lesser problems fold and give up.
Life keeps pushing you over but you keep getting up. That's some pretty tall cotton there, my friend. Be proud and stand tall. You deserve it. And so does your son.