The Mikaelson brothers

Finn Mikaelson: An Original vampire. The first son of Mikael and Esther and the second child in the family, Finn is the younger brother of Freya, the older brother of Elijah, Kol, Rebekah, and Henrik, and the older half-brother of Klaus.
Elijah Mikaelson: An Original vampire. The third child of Mikael and Esther, Elijah is the younger brother of Freya and Finn, the older brother of Kol, Rebekah, and Henrik, and the older half-brother of Klaus.
Klaus Mikaelson: An Original hybrid. Son of Esther and stepson of Mikael. Klaus is the younger half-brother of Freya, Finn, and Elijah, and the older half-brother of Kol, Rebekah, and Henrik. Klaus is an Original hybrid of a werewolf and a vampire. He is the first and only hybrid to be transformed into one through an immortality spell.
Kol Mikaelson: An Original vampire. The fourth child of Mikael and the fifth child of Esther, Kol is the younger brother of Freya, Finn, and Elijah, the older brother of Rebekah and Henrik, and the younger half-brother of Klaus. Kol was turned into a vampire around the age of 19, thus forever being stuck in the role of a spoiled teenager.