Question: Thorvald Eiriksson, was the son of Erik the Red and brother of who?

Context paragraphs:
Battle of Vinland (1010): Thorfinn Karlsefni was the first Norse explorer to attempt to truly colonize the newly discovered land of Vinland on the same site as his predecessors Thorvald and Leif Eriksson.  According to the Saga of Erik the Red, he set sail with three ships and 140 men.

Rögnvald Eriksson: Rögnvald Eriksson or Ragnvald Eiriksson (c. 920-933) was, according to "Egil's Saga", a son of Erik Bloodaxe.  It is unclear whether Rögnvald was Erik's son by his wife Gunnhild or by another woman; the "Heimskringla" does not mention him among Erik's children with Gunnhild.  When Egil Skallagrimsson escaped from Norway, he was pursued by Rögnvald, but killed him.

Erik Kilpatrick: Erik Kilpatrick is an American actor who is best known for playing Curtis Jackson on the CBS television series "The White Shadow".  He is the son of the late Lincoln Kilpatrick.  Erik and his father co-starred in ""Here's Mud in Your Eye"", an episode from the first season of "The White Shadow".  Kilpatrick has a younger brother, Lincoln Kilpatrick, Jr., and a sister, DaCarla Kilpatrick, who also are actors.  Kilpatrick is currently a divorced father.  Today, Kilpatrick devotes much of his time acting and directing for the Negro Ensemble Company, an acting troupe based out of New York City composed mainly of African-Americans.

Thorvald Eiriksson: Thorvald Eiriksson (Old Norse: "Þōrvaldr Eirikssonr" ; Icelandic: "Þorvaldur Eiríksson" ) was the son of Erik the Red and brother of Leif Erikson.

Erik the Red: Erik Thorvaldsson (Old Norse: "Eiríkr Þorvaldsson" ; 950 – c. 1003), known as Erik the Red (Old Norse: "Eiríkr hinn rauði" ) was a Norwegian Viking, remembered in medieval and Icelandic saga sources as having founded the first Norse settlement in Greenland.  The Icelandic tradition indicates that he was born in the Jæren district of Rogaland, Norway, as the son of Þorvald Ásvaldsson, he therefore also appears, patronymically, as Erik Thorvaldsson ("Eiríkr Þorvaldsson").  The appellation "the Red" most likely refers to his hair color and the color of his beard.  Leif Erikson, the famous Icelandic explorer, was Erik's son.

Thorstein Eiriksson: Thorstein Eiriksson (Old Norse: "Þórsteinn Eiríksson" ) was the third and youngest son of Erik the Red.

Eric Longbone, Lord of Langeland: Erik Eriksøn, also known as Eric Longbone (Danish: "Erik Langben" ), (1272–1310), Lord of Langeland, was the second son of Eric I, Duke of Schleswig and younger brother of Valdemar IV, Duke of Schleswig.

Battle of Vinland (1003): Thorvald Eiriksson had the first contact with the native population which would come to be known as the "skrælings".  After capturing and killing eight of the natives, they were attacked at their beached ships, which they defended:

Lars Lallerstedt: Lars Lallerstedt (born 1938) is a Swedish designer and industrial designer, one of the pioneers within Swedish industrial design.  Grandson of professor Erik Lallerstedt, son of architect Lars-Erik Lallerstedt and brother of Erik Lallerstedt, Swedish chef and restaurateur.

Thorvald Asvaldsson: Thorvald Asvaldsson (Old Norse: "Þórvaldr Ásvaldsson" ) was the father of the colonizer of Greenland, Erik the Red, and grandfather of Leif Ericson, who visited North America centuries before Christopher Columbus.  Thorvald's father was Ásvald Ulfsson, whose father was Ulf Oxen-Thorisson, whose father was Oxen-Thorir, brother of Naddodd, discoverer of Iceland.

Supporting paragraphs: Thorvald Eiriksson Erik the Red
Answer: Leif Erikson