Sister Bear is one of the main characters of the Berenstain Bears series. She is Papa Bear and Mama Bear's second child and Brother Bear's younger sister (by 2-3 years); and as of The Berenstain Bears and Baby Makes Five, she is a middle child. Sister Bear is 8 years old and in the third grade. Sister was first introduced in The Berenstain Bears’ New Baby in 1974. Cute little Sister Bear is a highly-competitive, (arguably tomboyish), born-to-win, self-reliant third-grader, who is often…