Confused on the way the Lion families work.

Hello! I was just rewatching Lion king, as it is one if my favorite movies, when a few questions came to mind. Obviously we have Mufasa, his wife Sarabi, and the their child Simba. What I’m confused about is who are the other lionesses? There are so many. We have Sarafina, and her child Nala, and that’s all we know. Are those lionesses allowed to mate? It seems so because of Nalas existence. Do they mate with rogues? What if a son was born that wasn’t royal, would he stay in the pride? Are there other, non royal lion families? Someone, please enlighten me! Thank you very much!!