I love Jane Eyre but James Fenmore Cooper is very hard to read. Maybe some Dickens instead? David Copperfield is a must for boys and girls.
Off of the top of my head, here are a few books on my list for that age range:
Uncle Tom’s Cabin-Harriet Beecher Stowe
David Copperfield-Dickens
Jane Austin novels for girls
Dr. Jekyll and Mr. Hyde
Little Women-Louisa May Alcott
Sherlock Holmes-Sir Arthur Conan Doyle
Girl of the Limberlost-Gene Stratton Porter
A Tale of Two Cities-Dickens