Answer:
Hamartia
Step-by-step explanation
The definition of hamartia is "a fatal flaw leading to the downfall of a tragic hero or heroine". In this context, the hero chose to marry his mother despite killing his father. A flaw that lead to his downfall. In normal 21 century society, that isn't normal. I also fact checked that statement, and there is no mention of sons marrying their mothers. The only "weird" relationships that history mentions were those of incest. Anyhow, when using the process of elimination, it isn't hubris since that means excessive ego. It also isn't parados because that is a part of an outdoor greek theatre. Stasimon is also incorrect because stasimon is a choral ode between 2 parts of a greek play. As per the citation, I would assume that page 9 isn't in the middle of this play because it isn't short. Therefore it isn't a stationary part. Final verdict - hamartia. Hope this helps :)