Grandpa Hugo
Grandpa Hugo is a fictional character created by Rob Zombie. He was portrayed by Dennis Fimple in House of 1000 Corpses.
Grandpa Hugo is arguably one of the more harmless members of the Firefly family. He doesn't engage in any acts of sadism or cruelty. Rather, he just seems to be a harmless (albeit dirty) old man.
Grandpa Hugo has a penchant for crude, sexual humor and loves telling dirty jokes. He's usually seen watching TV and yelling at the screen.
Fimple died not long after House was completed. Zombie omitted his role from the sequel, The Devil's Rejects, out of respect. It can be assumed that his character died of old age as well.
In an early cut of the film, Grandpa Hugo was revealed to be none other than Dr. Satan himself. Supposedly, the whole legend of Dr. Satan was to be a ruse concocted by the Firefly family to attract more victims, and Grandpa Hugo played the role of the sinister physician. Zombie later scrapped this idea, saying it would be too anticlimatic, and rather had the real Dr. Satan show up in the film's climax instead.