Does my son see ghosts?
It's possible. Maybe he has an imaginary friend? Or maybe he is seeing a spirit
your son could have a gift
You never know what you're messing with, so I'd suggest you don't encourage your child to communicate with this 'completely black' being. I've heard so many stories of children and even adults being fooled into communicating with and giving power to evil entities who disguise themselves as children in need or loved ones. They want to draw you in. Don't fall for it. If it's a loved one, then they will simply be there and protect your son. There is no need to reach out and try and communicate with them.
I hope your son lives a short life and dies soon. Get cancer slut