The books listed for Family and for 7-9 grade would be good for your 9th grader.
The Louise Vernon books are historical fiction about various Reformation men. They are not difficult reading level at all, but make good read-alouds for the whole family. I’ve included them to help make the Reformation men come alive and seem like real people rather than just famous names.
The way the handbook is set up, you would read Famous Men and when you come to one of the characters from a Vernon book, you would stop the Famous Men readings and read aloud the Vernon book. Then you would pick up with Famous Men and go to the next Vernon character. You can read an excerpt from the Vernon books on Christianbook.com to see if they are comparable to what you already have. Hopefully, that information will help you make your decision.