Jack is a child who never appeared in any video games, and certainly never existed, especially not in 'I Love My Little Boy' for the Nintendo 3DS.
SGF has never had children, he would never take the risk of playing with something so small...so... fragile. They really don't tell you how fragile something that heavy can be, it could happen to anyone.
That's why SGF decided to move to the country and start up a ranch, the horses don't judge him, they don't look at him like the jury did. He did nothing wrong, he never had a son or daughter and nobody can prove otherwise... nobody.
So now that his wife is on a long long vacation, SGF can relax in the warm breeze of his ranch, knowing it can never happen again... he's told himself that before, though....
Oh Jack... oh Jessica.