3. Roose Bolton
Now we’re entering sadist territory. Roose Bolton is a terrible father, not because he harmed his child, but rather because he encouraged psychopathic behavior. Roose Bolton is a cunning, ambitious man much like Macbeth, but without all the guilt. Roose has no problem backstabbing and scheming his way to top, like a more violent version of Littlefinger. But Roose is a terrible father because he uses his son like a wild dog and encourages his violent behavior.
Ramsay is a psychopath and rather than discouraging him, Roose pushes him towards more. He only mildly chastises Ramsay when he gets too extreme, such as his treatment of Sansa and Theon. Cersei may be many things, but at least she didn’t actively encourage Joffrey’s horrible behavior. Roose is one of the worst fathers in the Game of Thrones universe because he revels and uses his son’s psychosis instead of helping him.