If it is step sister then it would have to be from the MC mothers new lover / partner side which is the only way you can account for her age being the same as MC.why not step sister??
could be a daughter from another father???
and i do not think she knows
If she is a real step sister (i.e. same birth mother) then she would be either older or younger than MC and probably wouldn't be attending WVM with MC.
Personally, I don't think his sister (if he really has one) has been introduced yet other than in the dream sequence MC had.
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