I’m best friends with Lucifer’s half-human kid
(Do you mean me or Lilith???)
I mean Jack
(Luci doesn't even have a son?!)
Where are you coming from because my best friend is the nephilm (half-human, half-angel) named Jack and he is Lucifer’s biological son
(Lucifer isn't a human and he's not an angel. He's a fallen angel, and the king of Hell, who has no sons. But you are correct, Luci is married to a human man.)