This is the list of the known families. Please add your own.
Uchiha Family (Multiple species)
The Uchiha family is (Unknown details)
Ren (Head of the family/Alive)
Hikari (Brother of Ren /Alive)
Himitsu (Wife of Ren/Co-head/Alive)
Rose (Wife of hikari/Adopted daughter)
Ritsu (Son of Ren and Himitsu / Alive)
Rimitsu (Daughter of Ren and Himitsu /Dead)
Hataruke Family (neko)
The Nakamura family is currently in a feud-like state with the Hataruke family over the ownership of the three Umbra Vita Gemmis books.
Ice (Alive, Kizaru's unofficial sister)
Natsu (Dead, only a speculated member of the family)
Saiko (Alive, speculated member, Natsu's sister)
Nakamura Family (human)
The Nakamura family is currently in a feud-like state with the Hataruke family over the ownership of the three Umbra Vita Gemmis books. The Nakamura family greatly outnumbers the Hataruke family, but they are the only ones to have suffered casualities in the feud so far.
Unknown name (Killed by Kizaru, Ami's little brother)
Many others. The page would have more entries, sadly, the guy who made this page didn't get to meet them all before he ran for his life.
The Akari Family (human/demon/kitsune)
The family's founder is Akari, though she had no last name. Hikari used to be in this before his awkward divorce with Akari.
Akari - (Dead, Demon, Killed by Yuki, Kizaru, Hikari, and many more)
Yuki - (Alive, Human, Akari's adopted daughter)
Fray- (Alive, Kitsune, Akari's unofficial sister in the same way Ice is to Kizaru)
The Narukami Family (Human/Demon)
Violet Narukami - (Alive, Nagista's simmilar-aged sister.)
Raju Narukami - (Alive, The only demon of the family. Nagista's older brother.)
"The evil human dynasty that killed Silvir's old kingdom"
All members of this family were killed by Silvir. No exact names are known, but they were all human. And they were a large group of kings, queens, princes, and princesses.