Question: Who is Nero Claudius Drusus's father?

Knowledge 1: Nero Claudius Drusus
Nero Claudius Drusus Germanicus (January 14, 38 BC – summer of 9 BC), born Decimus Claudius Drusus, also called Drusus Claudius Nero, Drusus, Drusus I, Nero Drusus, or Drususthe Elder was a Roman politician and military commander.He was a patrician Claudian on his birth father's side but his maternal grandmother was from a plebeian family.He was the son of Livia Drusilla and the legal stepson of her second husband, the Emperor Augustus.He was also brother of the Emperor Tiberius, father to both the Emperor Claudius and general Germanicus, paternal grandfather of the Emperor Caligula, and maternal great-grandfather of the Emperor Nero.He launched the first major Roman campaigns across the Rhine and began the conquest of Germania, becoming the first Roman general to reach the Weser and Elbe rivers.In 12 BC, Drusus led a successful campaign into Germania, subjugating the Sicambri.Later that year he led a naval expedition against Germanic tribes along the North Sea coast, conquering the Batavi and the Frisii, and defeating the Chauci near the mouth of the Weser.In 11 BC, he conquered the Usipetes and the Marsi, extending Roman control to the Upper Weser.In 10 BC, he launched a campaign against the Chatti and the resurgent Sicambri, subjugating both.The following year, while serving as consul, he conquered the Mattiaci and defeated the Marcomanni and the Cherusci, the latter near the Elbe.However, Drusus died later that year, depriving Rome of one of its best generals. [SEP] Knowledge 2: Tiberius
Tiberius (16 November 42 BC – 16 March 37 AD) was the second Roman emperor, reigning from 14 AD to 37 AD, succeeding Augustus.Born to Tiberius Claudius Nero and Livia Drusilla in a Claudian family, he was given the personal name Tiberius Claudius Nero.His mother divorced Nero and married Octavian—later to ascend to Emperor as Augustus—who officially became his stepfather.Tiberius would later marry Augustus' daughter (from his marriage to Scribonia), Julia the Elder, and even later be adopted by Augustus.Through the adoption, he officially became a Julian, assuming the name Tiberius Julius Caesar.The emperors after Tiberius would continue this blended dynasty of both families for the following thirty years; historians have named it the Julio-Claudian dynasty.His relationship to the other emperors of this dynasty was as follows: he was the stepson of Augustus, grand-uncle of Caligula, paternal uncle of Claudius, and great-grand uncle of Nero.Tiberius' 22-and-a-half-year reign would be the longest after that of Augustus until that of Antoninus Pius, who surpassed his reign by a few months.Tiberius was one of the greatest Roman generals; his conquest of Pannonia, Dalmatia, Raetia, and (temporarily) parts of Germania, laid the foundations for the northern frontier.Even so, he came to be remembered as a dark, reclusive and sombre ruler who never really desired to be emperor; Pliny the Elder called him "the gloomiest of men".After the death of his son Drusus Julius Caesar in 23 AD, Tiberius became more reclusive and aloof.In 26 AD he removed himself from Rome and left administration largely in the hands of his unscrupulous Praetorian prefects Lucius Aelius Sejanus and Quintus Naevius Sutorius Macro.When Tiberius died, he was succeeded by his grand-nephew and adopted grandson, Caligula.
Knowledge 1: Nero Claudius Drusus
Nero Claudius Drusus Germanicus (January 14, 38 BC – summer of 9 BC), born Decimus Claudius Drusus, also called Drusus Claudius Nero, Drusus, Drusus I, Nero Drusus, or Drususthe Elder was a Roman politician and military commander.He was a patrician Claudian on his birth father's side but his maternal grandmother was from a plebeian family.He was the son of Livia Drusilla and the legal stepson of her second husband, the Emperor Augustus.He was also brother of the Emperor Tiberius, father to both the Emperor Claudius and general Germanicus, paternal grandfather of the Emperor Caligula, and maternal great-grandfather of the Emperor Nero.He launched the first major Roman campaigns across the Rhine and began the conquest of Germania, becoming the first Roman general to reach the Weser and Elbe rivers.In 12 BC, Drusus led a successful campaign into Germania, subjugating the Sicambri.Later that year he led a naval expedition against Germanic tribes along the North Sea coast, conquering the Batavi and the Frisii, and defeating the Chauci near the mouth of the Weser.In 11 BC, he conquered the Usipetes and the Marsi, extending Roman control to the Upper Weser.In 10 BC, he launched a campaign against the Chatti and the resurgent Sicambri, subjugating both.The following year, while serving as consul, he conquered the Mattiaci and defeated the Marcomanni and the Cherusci, the latter near the Elbe.However, Drusus died later that year, depriving Rome of one of its best generals. [SEP] Knowledge 2: Lars Eliasson
He is the father of the later Member of Parliament Anna Eliasson.
Knowledge 1: Nero Claudius Drusus
Nero Claudius Drusus Germanicus (January 14, 38 BC – summer of 9 BC), born Decimus Claudius Drusus, also called Drusus Claudius Nero, Drusus, Drusus I, Nero Drusus, or Drususthe Elder was a Roman politician and military commander.He was a patrician Claudian on his birth father's side but his maternal grandmother was from a plebeian family.He was the son of Livia Drusilla and the legal stepson of her second husband, the Emperor Augustus.He was also brother of the Emperor Tiberius, father to both the Emperor Claudius and general Germanicus, paternal grandfather of the Emperor Caligula, and maternal great-grandfather of the Emperor Nero.He launched the first major Roman campaigns across the Rhine and began the conquest of Germania, becoming the first Roman general to reach the Weser and Elbe rivers.In 12 BC, Drusus led a successful campaign into Germania, subjugating the Sicambri.Later that year he led a naval expedition against Germanic tribes along the North Sea coast, conquering the Batavi and the Frisii, and defeating the Chauci near the mouth of the Weser.In 11 BC, he conquered the Usipetes and the Marsi, extending Roman control to the Upper Weser.In 10 BC, he launched a campaign against the Chatti and the resurgent Sicambri, subjugating both.The following year, while serving as consul, he conquered the Mattiaci and defeated the Marcomanni and the Cherusci, the latter near the Elbe.However, Drusus died later that year, depriving Rome of one of its best generals. [SEP] Knowledge 2: Obata Toramori
He was the father of Obata Masamori.

Answer: Tiberius Claudius Nero