How was Claudius related to Caligula?

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Claudius was the uncle of Caligula.123

Specifically, Caligula was the son of Germanicus, who was the elder brother of Claudius. Because Claudius was the younger brother of Caligula’s father, he held the position of paternal uncle to the emperor. Despite this familial connection, historical accounts indicate there was little cordiality between the two men during Caligula's reign.342