Uranus

Dave’s sons were at his funeral, in chains and guarded by marshals.
Now, when I say sons, I really mean genetic clones.
Dave grew them in his twenties and raised them as his sons, but an accident at work left him crippled and sick.
His doctors told him they could replace what was damaged with donor material from his sons.
So, he invited them to dinner, drugged them, and faked signatures on consent forms.
When they awoke, they found themselves weary and mutilated.
One was dead, missing his heart and liver.
They had their savage revenge on the medical Uranus.