"What's a mansion?" Phoebe asked. "It's a big house," I said. "A very big house." I groped about for an example that would be relevant. "It's like...like the house in Home Alone . A very big, fancy, nice house with lots of rooms." "Is our house a mansion?" Phoebe asked. Mallory scoffed. "Our house is NOT a mansion. Our house is the OPPOSITE of a mansion. Our house is IN EVERY WAY the opposite of mansion." I think she needn't have been quite so emphatic about it.