I don't understand, Lorcan's mother was killed. and Lorcan was accusing the MC of killing his mother. How was that? What happened?
MC told Lorcan's father that they saw Lorcan's mother and paternal uncle 'wrestling' outside (there's a flashback to this in an earlier episode too, from MC's point of view). Basically Lorcan's mom was cheating. Lorcan's father killed Lorcan's mother because she was cheating on him. Lorcan was 10 at the time and had no idea what had happened, but realized that MC's snitching had something to do with it. He was a grieving kid who had no clue what really happened and lost everyone he loved (except Orla, ig) in one blow.
In his point of view, MC should've just kept their mouth shut.