Karen's big sister /
Ann M. Martin ; illustrations by Susan Tang.
- New York : Scholastic, c1996.
- 92 p. : ill. ; 20 cm.
- Baby-sitters little sister ; #69 .
- Martin, Ann M., 1955- Baby-sitters little sister ; #69. .
Karen borrows her sister's special pin without permission and loses it leading to their very first fight.