Sui-San was the wife of A'Lars and the mother of Thanos. They were all Eternals, and lived on the colonised planet called Titan. Sui-San and her husband were king and queen of the big city known as Tridondias. Both of them were peaceful, and they hated war. Their son Thanos thought differently about it; he wanted power above all else. Thanos poisened his mother and father, and they both died.