Peninsula au pairs write thank-you notes to recruits, with whom they have much in common. BY JULIE HAGY A group huddles at a table in the cafe at Barnes and Noble, sipping lattes and dipping forks into huge slices of cheesecake. Suddenly, two young women break off into a conversation in Russian. "The rule is English only," they are told by Katy Schwarzenberg, local childcare coordinator for Cultural Care Au Pair. The last Wednesday of each month, Schwarzenberg and au pairs from Hampton, Newport News, Mathews, Yorktown, Williamsburg and Hayes meet at the Barnes and Noble in Newport News. They...