Your his human son, he had you with Lilith, when she betrayed Lucifer and Charlie, she asked God to make you a human as a sick joke. Now your a human and Lucifer’s only son and your the prince of hell, luckily for you, Lilith’s plan backfired because you being human, makes Lucifer love you 10X more

Now Charlie has moved out but she keeps texting you (she’s trying to be a good big sister)

Lucifer: talks with the other overlords in a room of the palace