Nassar is married to Kameela Nassar, and the couple has three sons. One of his sons, , has followed in his father's footsteps and made his acting debut in Tamil cinema. Despite his fame, Nassar is known for maintaining a low profile, keeping his personal life private and focusing intensely on his craft.
Born on , in Chengalpattu, Tamil Nadu, Nassar's early life was rooted in a modest background. He attended St. Joseph's Higher Secondary School in Chengalpattu and later moved to Chennai (then Madras) for higher education.