In the Beatrix Potter stories, how many sisters did Peter Rabbit have?

Peter Rabbit is a fictional animal character in various children's stories by Beatrix Potter. He first appeared in "The Tale of Peter Rabbit" in 1902 and subsequently in five more books between 1904 and 1912.

The rabbits in Potter's stories have human characteristics and wear human clothes: Peter wears a jacket and shoes. Peter, his widowed mother, Mrs. Josephine Rabbit, as well as his sisters, Flopsy, Mopsy, and Cottontail live in a rabbit hole that has a human kitchen.It has human furniture, as well as a shop where Josephine sells various items. Peter's relatives are Cousin Benjamin Bunny and Benjamin's father, Mr. Bouncer Bunny.

Peter Rabbit was named after a pet rabbit whom Beatrix Potter had as a child, and whom she called Peter Piper. The first Peter Rabbit story, The Tale of Peter Rabbit, was created in 1893 initially as a letter to Noel Moore, the five-year-old son of Potter's former governess, Annie Moore. The boy was ill, and Potter wrote him a picture and story letter to help him pass the time and to cheer him up. The letter included sketches illustrating the narrative.

In June 1903, a trade edition of the tale was published by Frederick Warne & Co, and by the end of the year, 28,000 copies were in print. Over the years, "The Tale of Peter Rabbit" has sold more than 40 million copies worldwide, and as of 2008, the "Peter Rabbit" series has sold more than 151 million copies in 35 languages.