Manya

Manya is the wife of Nathan. She and Nathan own a house in Megaton and live there. If you ask anybody for the word around town, they will direct you to Manya (Manya's dialogue changes over in-game time?).

As evidenced by a holotape recording she keeps in her home, and by her own admission when you question her on it while carrying out the The Replicated Man quest, Manya is a member of the Railroad (an organisation dedicated to protecting and hiding androids escaping their owners).