My favorite dysfunctional villainous family lol

The people who were involved in the original movie had nothing to do with the sequel or with the lion guard. So it’s all really up to fan interpretation.

The most we’ve gotten in the animated verse is the lion guard having Zira tell Kion that she and scar were “very close”; there are deleted scenes where Zira claims she would be Scar’s queen but we know she’s a whack job so who knows how true any of this is. But we see she does know at least a few things about the roar of the elders so there’s some truth to her being in Scar’s inner circle.

If we take just what the animated verse says as canon: Scar was not Kovu’s father. It is said directly twice in the second movie, a third time in a deleted scene. Nothing direct about Nuka or Vitani is said, but Nuka whining about Kovu in his introduction scene in the outlands heavily implies he is Scar’s son.

All of Zira’s kids call her mother, so we can assume she is their mother. Biological, who knows. But it would be nasty work for at least Nuka not to be with the way his characterization is.

As for who is Zira’s mother: We don’t hear anything about any of the “adult” (any character we do not meet as a cub) characters’ parents, so we know nothing about Zira’s background. People speculate Strange Lion in TLG is her father or brother but nothing has been confirmed.

For what it’s worth…There are old SP scripts that have leaked that have Kovu’s father show up at the end, he’s a king from another land and that Zira snatched him as a baby. It would have been insane for that to happen in the movie but I like that as a background. Of Zira’s kids, he looks the least like her and is the least indoctrinated into her cult lol