Renards dear old dad may or may not have unknowingly fucked a devil. And that devil may or may not have spawned Renards half brother Tomas.
Maybe.
(It did)
Honestly Tomas is a (spoiled) sweet heart like his old man but that doesnt mean he doesnt like to mess with his big brother every once in a while. Renard doesnt really have a whole lot else to do in hell.
(And renard appreciates the fact that Tomas was there to take care of his old man when he couldnt)