Justin Morgan Had a Horse by Marguerite Henry (or any of the other M. Henry books) Amazon review  Newberry Honor from one of the greatest children's authors of horse stories, historical aspects of the Morgan horses  Facts on Fiction review

The Door in the Wall by Marguerite de Angeli  Amazon review  Newberry Honor from one of the greatest children's authors of horse stories, historical aspects of the Morgan horses  Facts on Fiction review

Little Britches: Father and I Were Ranchers by Ralph Moody (I love this book as did my oldest son)  Amazon review 

Little House: We could have a Little House on the Prairie series meeting if someone would like to organize that. For boys that resist reading this, Farmer Boy is a GREAT read. My oldest refused to read any of these until he read Farmer Boy. DJ enjoys the audiobooks.  It could be a read one or all kind of session.

The New Adventures of the Mad Scientist’s Club by Bertrand R. Brinley  Amazon review   See the reviews, about a gang of kids that have a lot of adventures.

Shen of the Sea, Chinese Stories, Arthur Chrisman (Newberry Medal Winner)   Amazon review 
Something different, a lot of these kids like mythology. The reviews are misleading as it looks like kids who were made to read it dinged it.

The Great Brain by John D. Fitzgerald   Amazon review   Really easy compared to others, but my older son enjoyed these books way past the “recommended” age. It’s a series, so others can be added, or add another fun classic like Thomas Rockwell’s How to Eat Fried Worms

The Sea Wolf by Jack London   Amazon review  High sea adventure, a book I never forgot reading myself.  May be more difficult to read for some, there are very good audiobook versions of it as well, widely available.

Men of Iron by Howard Pyle   Amazon review  Classic historical fiction set in medieval times. There are some very nice illustrated versions of Pyle’s writing you can find in juvenile sections of libraries. The language is a bit antiquated which I like for reading aloud.  

The Secret Garden by Frances Hodgson Burnett   Amazon review   I can't believe I've never read this classic, probably b/c we've been reading "boy" books for all these years. The movie and reviews indicate it is appealing to boys and girls. 

From the Mixed-Up Files of Mrs. Basil E. Frankweiler   Amazon review  I have heard so often that this is a wonderful story, but I have never read it.  Facts on Fiction review