Are Emily and Sarah in a relationship? It's sort of hinted at, but I didn't really figure it out.

After my parents' death, Em's long weekends in Madison soon led to a new job in the local elementary school. She and Sarah became inseparable partners, even though Em had maintained her own apartment in town and the two of them had made a big deal of never being seen heading into a bedroom together while I was growing up. This didn't fool me, the neighbors, or anyone else living in town. Everybody treated them like the couple they were, regardless of where they slept. When I moved out of the Bishop house, Em moved in and had been there ever since.