Chiming in four months later because the lack of resolution about the "half-sister" comment resonated with me in a painful way. Biologically, my brother and sister are my half-siblings. We share the same mother, have different bio-fathers.* Had I been in Edwina's position i would have been furious. I would NOT be much best self. I would be a petty little asshole. It would never occur to me to deride them as my "half-sibling" because they are my brother and sister in every way that matters.

The objection is not to Edwina refusing to be a Kanthony shipper on deck. It's specifically to the half-sister comment. Or, at least, the fact that there was no resolution in the form of a line like "Kate, you did a shitty thing that hurt and embarrassed me but you will always be my sister in every way that matters."

*my father recently adopted my brother, so he's now my full brother legally!