Three Great Families

Three Great Families is the name of three famous families with amazing spiritual power and abilities who, formerly, aimed to unify every spiritual being, Shinto or otherwise, under their own banner. All three of these families each descend from Kaguyahime (Tsukihime), Momotarou (Momoko) and Shuten-dōji and her children Korikka and Chacka (Arahabaki). They are one of the leading superpowers in the supernatural world alongside the Avalon Council, the G.O.C. and the Insurrection, and are an pivotal part of the Three Great Families Saga.

Hourai
The Hourai is the meeting place between the three families.

Tsukihime Family
Tsukihime Family (家族) is a family which is comprised of the descendants of the Moon Rabbit Princess Kaguyahime. Well known for their immense spiritual power and elemental-based Techniques, they rule the eastern side of Japan and, despite this, they're regarded as the most peaceful among the three families, and the ones who have made the most efforts into making peace between the three. It is currently lead by the Son of the Moon Miyatsuko Tsukihime, and it's next heiress is Fuyumi Tsukihime.
 * Kaguyahime (Ancestor)
 * Suigetsu Tsukihime (First Head) †
 * m. Unnamed Wife †
 * Unnamed Former Head †
 * Shiratsuki Tsukihime (Previous Head) †
 * m. Unnamed Wife †
 * Miyatsuko Tsukihime (Current Head)
 * m. Unnamed Wife †
 * Himeko Tsukihime
 * m. Taketori Tsukihime née Okina
 * Kamehime Tsukihime
 * Natsumi Tsukihime
 * Akimi Tsukihime
 * Harumi Tsukihime
 * Fuyumi Tsukihime (Heiress)
 * Tsukimi Akutagawa née Tsukihime
 * m. Ryuunosuke Akutagawa
 * Ryuuda Akutagawa
 * m. Momoe Akutagawa née Momoko
 * Tatsuya Akutagawa

Momoko Family
Momoko Family (家族) is a family which is comprised of the descendants of the hero Momotarou. Known for their powerful peach-based Techniques, they rule central Japan and have several sects within both the east and west sides of Japan. They are regarded as the most secretive of the three families, yet, the most talented when it comes to the development of Techniques. They are also currently the smallest of the three, after their nigh-extinction during the Sengoku period and their unknown lack of capable children. It is currently lead by the Sakura Yaksha Momozono Momoko, and it's next heir is her nephew Hakuto Momoko.
 * Momotarou (Ancestor)
 * Momoko (First Head) †
 * m. Unnamed Wife †
 * Unnamed Former Head †
 * Momojou Momoko (Former Head)
 * m. Unnamed Wife
 * Momozono Momoko (Current Head)
 * Momoji's and Hakuto's Father (Former Heir) †
 * m. Unnamed Arahabaki †
 * Momoji Momoko
 * Hakuto Momoko (Heir)
 * Momoe Akutagawa née Momoko
 * m. Ryuuda Akutagawa
 * Tatsuya Akutagawa

Arahabaki Family
Arahabaki Family (家族) is a family which is comprised of the descendents of the demon Shuten-douji and her daughter Korikka and son Chacka. An family of Oni, they are well known for their immense raw power, where they can become stronger by consuming alcohol, and their mastery in both fire and ice magic and Techniques. They rule the western side of Japan and, while regarded as the most violent and gluttonous of the three, they're also regarded as the wisest and second in making efforts into peace between the three. It is currently lead by the current Ouki Oujima Arahabaki, with no set heir.
 * Shuten-douji (Ancestor)
 * Korikka (First Head; First Ouki) †
 * Unnamed Second Head †
 * Unnamed Previous Head †
 * m. Daijima Arahabaki (Previous Ouki) †
 * Oujima Arahabaki (Current Head; Current Ouki)
 * Rurijima Arahabaki
 * m. Liu Hong
 * Ryuubi Arahabaki
 * Rushima Arahabaki
 * Unnamed Arahabaki †
 * m. Momoji's and Hakuto's Father †
 * Momoji Momoko
 * Hakuto Momoko
 * Chacka †

Branch Families

 * Tsukihime Branch Families
 * Kuroe Agency
 * Okina Clan
 * Taketori Tsukihime
 * Momoko Branch Families
 * Sakura Demons
 * Urajiro
 * Sugi
 * Kintoki Sakata
 * Unnamed Oni
 * Katsura
 * Hashidoi
 * Asada
 * Inuha Clan
 * Saruchi Clan
 * Kijino Clan
 * Arahabaki Branch Families
 * Kiryuuin Clan
 * Kiryuu's Father (Former Head; deceased)
 * Kiryuu (Current Head)
 * Kibana
 * Jajima's Clan
 * Jajima
 * Gyoubu Clan
 * Guan Yu

Trivia

 * The Three Great Families are based on the Three Big Families from Yuragi-sou no Yuuna-san and the Three Factions and Five Principal Clans from the High School DxD series, both series of which the creator is a fan of.
 * The current Daimyō Trio each represent one of the three families: Ieyasu Tokugawa represents the Tsukihime Family, Nobunaga Oda represents the Momoko Family, and Hideyoshi Toyotomi represents the Arahabaki Family.
 * The Three families each has an naming theme: each member of the Tsukihime family is somehow related to the moon or the four seasons; the Momoko family each has the ideogram for Peach (桃, Momo) in their name; and the Arahabaki family each has the ideogram for Island (島, Jima) in it.