Three piglets were left at home while their mother Mrs. Pig went to market. There were two older girls named Porcina and Swindia, and a baby piglet Hogan. Porcina always tells the truth. Swindia always lies. Hogan is too young to talk, but is adept at destruction. Their mother, Mrs. Pig, arrived home and surveyed a scene of chaotic destruction. "WHO DID THIS?!" she squealed.
The older girl-pig said, "We all did it."
The younger girl-pig (the middle sibling) said, "He helped do it," pointing to Hogan.
What are the names of the older sister and the younger sister?
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