But GM is daughter of duke, GD is originally a low ranking rural noble (now duke since marrying into his wife's title). And Anna is a commoner. So if AM were GD's sibling then she would have been low ranking nobility, rather than a commoner.
anna's mom is most likely
not a commoner.. or even a low ranking noble. three points of evidence for this. 1.) in chapter 21 Anna's mom talks in great detail about the "manners of a noble" and doesn't flinch in the presence of being in front of Grace even though she is the duke's daughter. 2.) when confronted on this information by grace her poker face is utter trash alluding to her being "very" well versed in nobility. 3.) when Grace's father sees Anna's mom she performs a
perfect curtsie as is expected of high society but furthermore quietly "shushes" him when he sees her.
My thoughts are this Jacquline and Anna's Mom have "switched places" like in the play for specific reasons. Jacquline never mentions
whom she wants to see specifically we are assuming it's grace but what if she meant anna?
