I guess it's too late to warn readers about plot spoilers, since some of them appear in your question, but for anyone who's worried, even more of the show's story details will be revealed in this answer. Fortunately, the characters of "Lucifer" have so much background that this is all just a drop in the bucket.

The family tree of the show works like this: Lucifer (Tom Ellis, "Miranda") is the devil, an angel cast out from heaven to become ruler of hell -- that's fairly standard Abrahamic-religion stuff. However, the show starts playing with things after that. Lucifer, as with all angels on the show, is the child of God and God's wife, referred to variously in the show as Goddess of All Creation, Mother of Angels and, more recently, Charlotte (Tricia Helfer, "Burn Notice").

Back when Lucifer was still ruling hell (before he left to become a police consultant on Earth, which is the premise of the show, and which sounds a little silly written out like that), God cast Lucifer's mother out of heaven as well -- they never got along after he created humanity, which she thought was a bad idea. He sent her to hell, where Lucifer could essentially hold her prisoner. She later followed Lucifer to Earth, which kicked off the events of the ongoing second season. 

If this all sounds a little hard to swallow, bear in mind that the show is based on a series of comic books. This is fairly normal stuff by comic standards (anyone who's seen the big-screen Avengers movies, also based on comics, knows they have gods who occasionally get beat up by mutants and robots).

You should also bear in mind that, weird as it may be, Fox has a lot of faith in the show (no pun intended). The network promoted "Lucifer" from midseason to fall this season, and recently extended season 2's run by nine episodes. It hasn't started handing out renewals yet, but "Lucifer" seems to stand a pretty good chance.

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