There are four sets of parents we most want to meet:
Toby and Jenna's parents: We want to meet the 'rents who apparently totally missed that Jenna Marshall (Tammin Sursok) is creepy and evil and was also sexually harassing Toby (Keegan Allen) for a while. We can't really imagine what they're like.
Mona's parents: She has to have them, right? We want to know how Mona's (Janel Parrish) parents react now that their daughter is locked up.
Alison's dad: What is he like? What does he know? Enquiring minds want to know.