Anastasia's family called Anastasia and her older sister Maria "The Little Pair". This was because they shared a room, often wore the same dress, and played together a lot. Their older sisters Olga and Tatiana were known as "The Big Pair", because they shared a room as well. The four girls sometimes signed letters with their nickname, OTMA. They made this nickname from the first letters of their first names, Olga, Tatiana, Maria, and Anastasia.