Evangeline - Chapter 32

So is the brother a dumbass or just if not evil, complicit in Izolde’s shitty behavior? Cause he doesn’t seem too bad a dude but also seems to greatly care and believe in his sister so it makes me wonder. Also does no one find it weird that the Duke is calling Evangeline by his dead daughter’s name? Cause he was excited to have a girl and the duchess seemed fairly far along so it’s not like her existence didn’t have time to set in.