Also on 10 October 19, his wife Livilla had given birth to twin sons, Tiberius Gemellus and Germanicus, whom he named after his adoptive brother. Their birth was celebrated by his father who claimed that never before in the history of Rome had twins been born to a man as high in rank as Drusus, and the event was commemorated on the reverse of coins. Tiberius had hoped that Drusus would keep the imperial family together and entrusted him with the guardianship of Germanicus' sons, Nero and Drusus.