Since Vicky and Meg's daughter, Polly O'Keefe, both date Zachary Gray, Vicky and Suzy are referring to events a generation earlier. The Murrys and the Austins live in similarly-described rural settings in Connecticut, so the Austins' knowledge of the Murrys may be locally-derived.
Vicky and Meg's daughter Polly O'Keefe is dating Zachary Gray alongside both Vicky and Suzy. This suggests they are referring to events from a previous generation. The Murrys and the Austins live in comparable rural Connecticut areas, so the Austins' understanding of the Murrys could be derived locally.