Crackhead theory
Uriel is Marie's son, pic related. Marie knows this, but she know's Uriel is her child. Lyon is the father, Marie does not know this.

Amanda Krueger is Freddy Krueger's mother, right? She was impregnated by 1 of 100 "maniacs" during her tenure at the Hathaway House (an asylum). Before this, Amanda had changed her name to...Saint Mary Helena.

It is my theory that Uriel is the equivalent to Freddy, the bastard son of 100 maniacs (who these are in lore, up for debate), the drama will stem from Marie and Lyon tussling with fact that they've failed their son.