Well I'm not sure if you're familiar with them but...the Ars Goetia family. They're a family of demons, highly prodigious group, of them actually. Most of the demons I come across either work for them or are in some subsection of a business they own.

[ Aside from Lucifer they're one of the main branches of families Helios has encountered. ] They actually invited me over one time to their estate in Greece.