After killing his foster-father, he went to Hindfell on his horse Grani, where he impersonated a man named Gunnar to get into a tower.  
He killed his foster-father after killing his foster-father's brother, which took place after his foster-grandfather, Hreidmar, had been killed by them.  After killing his foster-father, he went to Hindfell on his horse Grani, where he impersonated a man named Gunnar to get into a tower.  All that killing was due to a hoard of gold which had belonged to Andvari the dwarf, which was coveted by both Regin and his brother Fafnir.  FTP, name this hero of the Volsung Saga, whose sword Gram was forged from the broken pieces of his father Sigmund's sword and who freed the Valkyrie Brunhilde.
He killed his foster-father after killing his foster-father's brother, which took place after his foster-grandfather, Hreidmar, had been killed by them.  
Sigurd