Aldo Andretti (born February 28, 1940 in Montona d'Istria, Italy (now Motovun, Croatia)) is the twin brother of Mario Andretti and the father of John Andretti and Adam Andretti. He is the uncle of Michael Andretti and Jeff Andretti, and great-uncle of Marco Andretti. Aldo and Mario are identical twins. However, due to facial reconstructive surgery following a major racing accident, Aldo does not look identical to Mario.

Aldo and Mario were born in Italy, where they were inspired by watching the great Alberto Ascari race at Monza. After World War II Istria (which is now part of Croatia) was occupied and annexed by Yugoslavia. His family, like many other Italian Istrians, fled in 1948. They lived in a refugee camp from 1948 to 1955. The family settled in Nazareth, Pennsylvania and the brothers discovered racing on an oval track in their home town.

• Reference; Wikipedia