<Li> Nia Peeples portrays Pam Fields, the mother of Emily as well as being the wife of Wayne . </Li> <Li> Sasha Pieterse portrays Alison DiLaurentis, the former "Queen Bee" of her clique, and the most popular girl in school before her disappearance . She enjoys using people's deepest secrets against them to keep them in line . Charming and manipulative, Alison managed to manipulate all four of her friends in one way or another and is skilled at finding ways to blackmail others . It was later revealed that Alison is alive and was on the run from "A". </Li> <Li> Janel Parrish portrays Mona Vanderwaal, the original and first "A". She is the person who stalked Alison before her disappearance, and did this as revenge for Alison crowning her "Rosewood's biggest loser". After Alison disappeared she became best friends with Hanna Marin and they transformed themselves into the most popular girls at school, taking Alison's place . </Li> <Li> Andrea Parker portrays Jessica DiLaurentis and Mary Drake, twin sisters . Jessica is the mother to Alison and Jason, while Mary is revealed to be the mother of Charlotte, and Spencer and Alex. Mary was admitted to Radley Sanitarium for most of her life, but has now returned to Rosewood . </Li>

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