Yes and no. He was very young and did not entirely understand what had happened then. His mom took the blame and, to reinforce the story, even wrote the book.
He does comment something along the lines that he always knew but just hadn't acknowledged it.
for me, yes and yes. he was young, but not young enough to not know death, and he's a reader guided by her mom. he thought of killing his father when he picked up that knife. sure, his dad fell to his death, but the guilt of having the thought was there. it's the trauma that made him latch onto his mom's retelling of what happened. he embraced the false truth that his mom was the murderer to protect himself from the guilt, he blamed and hated her. her mom must've done it out of love, but because of it Dokja wasn't able to heal TT
tldr: marriage is scary
kdj killed his father right? It's the trauma that made him think his mum killed him instead?