How was the Inca imperial line kept pure?

Name: How was the Inca imperial line kept pure?
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The Inca imperial line was kept pure by the practice of the Sapa Inca always marrying his sister. This ensured that the children of the Inca rulers had pure Inca bloodlines and maintained the integrity of the royal family. This practice, known as "incestuous marriage," was also believed to have had a religious significance in Inca culture.

How Was the Inca Imperial Line Kept Pure