The Hero and the Crown by Robin McKinley

The Earthsea series by Ursula LeGuin

The Dragonlance Chronicles by Margaret Weiss and Tracy Hickman

The Belgariad and The Mallorean by David Eddings

The War of the Blades series by J.D. Hallowell

The Shannara series by Terry Brooks

Here's the list with Amazon links in case you don't feel like clicking through.

6. Erasure by A.T.H. Webber

5. Force of Habit by Marian Allen

4. Cinderella's Secret Diary: Lost by Ron Vitale

3. Dragon Fate by JD Hallowell

2. The Northern Star: The Beginning by Mike Gullickson

1. Riddle in Stone by Robert Evert

I was bored so I checked which titles/authors are on the Underrated and Underread list.

Titles that are on the Underrated/Underread list:

As the Crow Flies - Robin Lythgoe


Authors who have other works on the U&U list

Robin Lythgoe

• Dragonlace
  
• In the Mirror
  
  J.D Hallowell
  
  
• Dragon Fate

Dragon Fate was on the Epic Fantasy bestsellers list at Amazon.com every day for 7 weeks earlier this year; I'm surprised you didn't see it.

I second the recommendation for Blood Song, though. Maybe it isn't on this list because it is already so well-known.

I'd also add Moses Siregar's work to the list.

Here are some links for the product in the above comment for different countries:

Link: Dragon Fate

• UK: amazon.co.uk
  
• Spain: amazon.es
  
• Mexico: amazon.com.mx
  
• France: amazon.fr
  
• Germany: amazon.de
  
• Japan: amazon.co.jp
  
• Canada: amazon.ca
  
• Australia: amazon.com.au
  
• Italy: amazon.it
  
  
  This bot is currently in testing so let me know what you think by voting (or commenting).

Some of the Valdemar books, by Mercedes Lackey, are pretty good - I can't speak for the others, since I haven't read them yet -, as is the Elvenbane series, which she worked on with Andre Norton.

And then, speaking of Andre Norton, there's the Witch World series, of course, or at least what I've read of it, including some of the stuff by other authors in the same setting.

The Dreaming Tree, which is an omnibus of two others, by C.J Cheryh, and the Morgaine series, by the same, are quite good.

Dragon Fate, if you have a Kindle or e-reader software.

There are more but it's one-thirty in the morning, so... Maybe tomorrow.

(And yes, I know it's a bit late, but I figure that since your family likes to read, recommendations are always going to be nice.)