Sorcerer Families (
The three great sorcerer families of the jujutsu world are the Zenin Family, the Gojo Family, and the Kamo Family. They appear to descend from the Big Three Vengeful Spirits (日本三大怨霊 Nippon San Dai Onryō?) of Japan, each of whom were powerful sorcerers of the Heian Era, the height of jujutsu sorcery. Due to this and the powerful cursed techniques passed down through their clans, the Big Three Sorcerer Families have gained great political prominence in jujutsu society.
Each of the big three sorcerer families has information on the other, and the word gets out on their inherited techniques. There is a struggle for dominance between the three families, as well as genuine bad blood. The Zenin Family and Gojo Family heads clashed at one point in the past and killed one another, starting what would become a feud between the two families. The prior head of the Zenin Family, Naobito Zenin, has stated he wouldn't mind the Gojo Family going out of power despite Satoru Gojo being the deterrent from curses taking over Japan.
There are various other sorcerer families as well, such as the Inumaki Family. They possess an inherited technique as well and while not as respected on the same level as the big three families, they are still well recognized by sorcerers.
The Zenin Family and Kamo Family especially value blood ties and the ability to use inherited techniques above all else. The Zenin Family are known to reject those without quality cursed techniques and in certain circumstances, such as with Megumi, are willing to pay to introduce those with inherited techniques back into the clan. Despite being an illegitimate son, the Kamo Family reluctantly raised up Noritoshi Kamo to be the next head of the clan because he possesses the inherited technique.