Page "Caligula" Paragraph 22

He had his cousin and adopted son Tiberius Gemellus executed – an act that outraged Caligula's and Gemellus's mutual grandmother Antonia Minor.

She is said to have committed suicide, although Suetonius hints that Caligula actually poisoned her.

He had his father-in-law Marcus Junius Silanus and his brother-in-law Marcus Lepidus executed as well.

His uncle Claudius was spared only because Caligula kept him as a laughing stock.

His favorite sister Julia Drusilla died in AD 38 of a fever: his other two sisters, Livilla and Agrippina the Younger, were exiled.

He hated the fact that he was the grandson of Agrippa, and slandered Augustus by repeating a falsehood that his mother was actually the result of an incestuous relationship between Augustus and his daughter Julia the Elder.