I took it like they were just completely delusional, in the same way the that fishermen and basically everyone on the Nautiloid were all tripping out pretty hard. Like that none of the Novices were siblings, and it was just absolute trickery messing with their minds. Had them thinking they were all family. They're basically the first cultists we run across, but even then I still read more like they were just legit bewildered and bewitched as opposed to a monkish kind of brother sister vernacular. Andrick and Brynna are now neck and neck for Best Hair too, since she wound up with the Minthara rocker hair in the end and his is amazing. Some of the better NPCs in the game in my view lol

[Linked Image from i.ibb.co]