Board Thread:Spoilers!/@comment-25375217-20171001030631/@comment-1916997-20171203010053

Eskaver wrote: Cool, I was about to make a post about how they couldn't credibly tell us that Ella and Drizella are the same age when Jace is a mom of a ten year old girl and Ivy looks like a mean girl right out of college.

So, it could end up being that weird complicated "My father, who's really my stepfather, married my stepmother and had children which are my stepsisters (though really, they shouldn't be considered stepsisters, right?). They are stepsisters, because they aren't biologically related to Cinderella.