As TG said, “ancestor” implies several generations in-between. Therefore, without more information, it’s easy to infer that someone down the line had a child with a Tamaranean. That doesn’t mean in the slightest that Mar’i Grayson would be involved. Nightstar is not even confirmed to exist in the same timeline as the hybrid you mentioned (Future State). Besides, if you actually go to the page for the character you mentioned, you can see the relatives section. You can click on his father’s page and learn that he’s Kryptonian. As a result, we can infer that this new hybrid’s mother is the Tameranean, making him (likely) half-Tameranean, and we simply don’t know their mother’s name.
