With Priscilla, this is my best understanding:
Teresa has killed a lot of Yomas. Near Awakened "Orcish" Priscilla is probably refering to her Yoma body's half's "Yoma parents/family".
With Miata... it seems that Miata thinks that her parents WERE killed intentionally (possibly by a Claymore or Black Coat), hence Miata's reaction ~"Did you kill my parents?", as if she's seeking the killer/murderer of her parents. Possibly, she was too young to recognize/remember whom killed her parents when it happened.
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the nursing pages are brief... enjoy them while you can, lol.
but, you're going to be seeing some Priscilla-A in her human/Claymore form/body, *grins*