Hreidmar was father to Fafnir, Regin, and Ótr. After Loki killed Ótr in otter form and paid weregild with Andvari's cursed gold, Fafnir murdered Hreidmar for the treasure and drove Regin away, transforming into a dragon to guard the hoard alone.
Regin became Sigurd's foster-father at the court of King Hjálprek, teaching him languages, runes, and skills. But Regin's true purpose was to manipulate Sigurd into killing his brother Fafnir so Regin could reclaim the cursed treasure of Andvari.
Fafnir drove Regin away after murdering their father and claiming the cursed gold. Regin nursed his hatred for years, forging the sword Gram and raising Sigurd as a weapon against his brother, orchestrating the dragon's death from behind.
After slaying Fafnir, Sigurd tasted the dragon's blood and gained the ability to understand birdsong. The birds warned him that his foster-father Regin planned to kill him for the treasure, so Sigurd struck off Regin's head with Gram.
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