Question: Thorvald Eiriksson was the brother of an explorer who is believed to be the first known European to discover what continent?
Sentence (from "Thorvald Eiriksson"): Thorvald Eiriksson (Old Norse: "Þōrvaldr Eirikssonr" ; Icelandic: "Þorvaldur Eiríksson" ) was the son of Erik the Red and brother of Leif Erikson.
Relevant evidence: Yes