Responses
In the novel they're related to the uncle. Their mother is the uncle's sister
Why do i think that the step-grandchildren is a mistranslation (?) Like they dont carry the 'seeds' that is ideal for lineage because their mom. In a lot of Asian lineage only the male carry the last name so people usually want atleast one son to kept their lineage.
They say they are part of that group of really smart people because they are related and are genetically intelligent (or so I understand) but in chapter 12 the twin say they are adopted… sooo they are not blood related to the uncle?