She waited until the upstairs had been silent for half an hour. Once when she had snuck into another cellar while the family slept upstairs, she made the mistake of going up the stairs immediately after the couple left for work. It had almost been a disaster when the husband rushed back home just minutes later to pick up his forgotten mobile. Hermione wasn't sure when those devices became a necessity for every single Muggle to possess and carry around at all times, but since hiding in the Muggle world, she discovered there was a great deal about their society that she didn't understand. Life had gone on while she was tucked up in Hogsmeade learning how to be a good Death Eater. Without her parents" tie to the world, she was a practical stranger.