Fate vs. Free Will
In this graphic novel, Steven is obviously fated by Huntinton's Chorea. Although he is unaware as to whether or not he will get it, he still feels fated. I believe that is where the fate stops. It is his choice to become a recluse and refuse to answer calls. It is his choice to tell Lisa that he does not want children. However he does so because he feels like there is nothing left for him to do. He is haunted by the words his father said "...because if we'd known about the goddamn disease we'd never have had David and Steven in the first place!" Steven lets this hit him close to home and when he tells Lisa he doesn't want children I think he is turning into his father a little bit. Steven is battling anger for what his father said and for feeling the same way. Much like Oedipus, Steven was born and after his father learned about Huntington's Chorea, he realized he should not have children. Much like when Oedipus' father learns about what his son is supposed to do, he tries to get rid of him.