How was Augustus related to Julius Caesar?

Augustus was the great-nephew of Julius Caesar, as his mother, Atia, was the daughter of Caesar's sister, Julia.1

Beyond this biological connection, Julius Caesar played a significant role in Augustus's early life, introducing him to Roman public life and involving him in military campaigns. In his will, Caesar formally adopted Augustus as his son and named him his chief personal heir, a decision that ultimately propelled Augustus to power following Caesar's assassination.123