system
Given the following post, respond as if you're commenting on Reddit:
human
[DC comics] How is superman the last descendant of Rao and the reason of him being the strongest Kryptonian is because of this when Kara his cousin should also have the same demigod blood and be a descendant?
gpt
Kal-El is not the last descendant of Rao - he may however be the last **pure-blood** descendant, whatever that means in Kryptonian culture.

If it's anything like Egyptian pure-blood descendants of Ra, Kara probably doesn't qualify due to her mother not being a close enough relative of the house of El - IOW she's insufficiently inbred.