You know there was an actual Disney website that states Zira is Scar's sister:
http://disney.go.com/disneyvideos/animatedfilms/lionking112/helpful_hints/jungle_king.htmlScar probably didn't have a mate as all of the Pridelander lionesses rose up against so none of them had any sexual feelings for them. Also, remember none of the Outsider lionesses were present because they weren't created yet so I assume they were served as an separate hunting party since Scar wasn't satisfied with Sarabi's. Another fact to take to account is that none of the Outsider lionesses except Zira and Vitani are given prominent roles in
Simba's Pride so, if Zira was Scar's daughter, why doesn't she mention her mother? Why isn't she driving Zira to drive Kovu to avenge Scar? Finally, an obvious notation is that she calls Scar by his name, not by "Dad". So, I think it's hard to believe Zira is Scar's daughter.
Darrell Rooney cleared up a while ago that Zira is not Scar's mate, but she was written to be before they rewrote her as a follower to avoid the characters taking part in incest. Fans can still believe what they want, but they should still be aware of the truth.
[quote="DGFone"]If I recall correctly, it's official that Zira is a generation older than Simba - making her of Scar's generation. This means that she can't be his daughter.[/quote]
Zira's age was never confirmed as far as I have heard. If Zira was a generation older than Simba, she will be almost as old as Sarabi. This leads to the question how can she still be able to compete in a fight with Simba? I reckon Zira to be just slightly older than Simba and Nala, but still in the same generation.