Question: Who is Livilla's maternal grandfather?
Sentence (from "Livilla"): Claudia Livia Julia (Classical Latin: ; c. 13 BC – AD 31) was the only daughter of Nero Claudius Drusus and Antonia Minor and sister of the Roman Emperor Claudius and general Germanicus, and thus the paternal aunt of the emperor Caligula and maternal great-aunt of emperor Nero, as well as the niece and daughter-in-law of Tiberius.
Relevant evidence: Yes