I don't claim to be an expert when it comes to the mating habits of lions, but it's clear that we only meet two male lions at the beginning of The Lion King. This begs the question, who is Nala's dad? Is it Mufasa? If so, then Nala and Simba are half-siblings and the entire love story is well . . . gross. If her father is Scar, then they'd be cousins, which isn't any less gross to be honest. I suppose the third option is that her father is a lion we never meet, as it's made very clear that Mufasa and Sarabi are monogamous.