Paullus Fabius Maximus was the elder son of Quintus Fabius Maximus (suffect consul 45 BCE). He had one younger brother, Africanus Fabius Maximus and a sister, Fabia Paullina. Their father died on the 31st of December, 45 BCE.
Paullus was named in honour of Lucius Aemilius Paullus Macedonicus, who was either his natural paternal great-great-grandfather or great-great-great-grandfather.
Read more about Paullus Fabius Maximus: Career, Marriage and Children, Patron of Poetry, A New Calendar in The Province of Asia, Later Life and Death