I don't recall them being cousins, but sisters. Do you remember the chapter??? Catalyste
I do not have the chapter, it must be around the starting ones, but I also recall them being cousins. I think the empress only has one brother, which is the one that takes over the family when her father dies.
The empress knows that the law will only permit inter-family marriage if they're third cousins and beyond...
But Astana and Lorraine are 1st cousins. Their mother's are sisters.
So was this a mistranslation or is there something else I may be missing???