Who was the brother of XXX?
Jörmungandr
In Norse mythology, Jörmungandr (Old Norse: Jǫrmungandr, pronounced (ˈjɔrmuŋɡandr̥), meaning ``huge monster''), often written as Jormungand, or Jörmungand and also known as the Midgard Serpent (Old Norse: Miðgarðsormr), or World Serpent, is a sea serpent, the middle child of the giantess Angrboða and Loki.