question: Who is the father-in-law of Marcus Vinicius (Consul 30)?
context: Title: Julia Livilla
  Passage: Julia Livilla (Classical Latin: , also called or) (early AD 18 - late AD 41 or early AD 42) was the youngest child of Germanicus and Agrippina the Elder and the youngest sister of the Emperor Caligula. She is sometimes known as "Lesbia" for her birthplace.
  Title: Marcus Vinicius (consul 30)
  Passage: Marcus Vinicius (c. 5 BC – AD 46) was a Roman consul and, as husband of Julia Livilla, grandson-in-law ("progener") of the emperor Tiberius. He was the son and grandson of two consuls, Publius Vinicius (consul 2 AD) and Marcus Vinicius (consul 19 BC).
answer: Germanicus
citations: Marcus Vinicius (consul 30) Julia Livilla