Spoilers

“Caleb”

And with that, we understand why Norma has always had a bad relationship with Dylan despite him being her first born son.

The end of this episode dropped a major bomb as Norma revealed to Norman and Dylan, who were in the middle of a physical fight (that Norman was totally kicking his butt, by the way), that Caleb, her brother, was Dylan’s father.

Dylan had met with Caleb and befriended him and Caleb gave him a story about his own father, acting like that was why Norma had such a problem with him. When Dylan went to bat for him with Norma, she told him that Caleb had raped her for years, but Dylan did not believe it. This is what led to Norman and Dylan’s fight and Norma’s confession.

The rest of the episode had some building blocks for upcoming stories, but this was the biggest fire of the episode.

Clearly, Dylan is a memory of the rapes for Norma, which is the reason why she had treated him so differently than she treated Norman.