My Mother, My Friend (S05E12)
Mallory invites her new friend, Allison King, over to study, unaware that Allison will click with Elyse on a deeper level. Their shared passion for architecture quickly forges a strong bond, with Allison even choosing Elyse as the focus of her architecture project. They dive into their studies, hit the shops, and explore exhibits, always including Mallory, yet she starts to feel like an outsider. Tensions rise when Allison is invited to dinner at the Keatons after acing her project. In a moment of frustration, Mallory expresses her jealousy and storms out, leaving her mother bewildered. Upon returning home, Mallory and Elyse must confront the stirrings of conflict that Allison's friendship has caused, ultimately reaffirming their sisterly bond over shared interests.