Kensington Palace in London is now home to 15 members of the royal family, spanning three generations. The palace, a royal residence since the 1600s, has taken on three new arrivals in the last month, making it easily the most bustling of the royal family's many grand homes. Prince William, Kate Middleton, and their three children share a grand 20-room apartment that spans four storeys. Prince Harry and Meghan Markle live in a cottage on the palace grounds, which is where Harry proposed.