Eli reminds me of Dudley Dursley. A child who is corrupted and turned into a monster by one's parents is someone to be pitied, not necessarily forgiven, but pitied.
Though, with the magical powers in the mix and manipulations, the Sperado family also reminds me of the White Court of vampires from the Dresden Files, but less sexy and smart.
Either way, the road to redemption is long and hard. I doubt Eli will make it.
As for the Duchess, let the tranquil wrath be unleashed.
Also, shame that servant didn't drop the axe on his foot.