Aldo Andretti, the twin brother of auto racing legend Mario Andretti and father of the late John Andretti, died Wednesday night at 80, according to a release from Andretti Autosport. The IndyCar team said Aldo Andretti “passed peacefully with a heart full of love and spirit.”

In a tweet Thursday afternoon, Mario Andretti wrote that “Aldo Andretti, my loving twin brother, my partner in crime and my faithful best friend every day of my life was called to heaven last night. Half of me went with him. There is no eloquence. I’m shaken to my core.” Aldo and Mario were born in Montona, Italy, and spent several years in a Tuscany refugee camp before immigrating with their family to the United States in 1955.