If you'd like something to really make your kids consider how thinking outside the box can be applied even to creativity, I highly highly highly recommend Redwall, by Brian Jaques.
It's an entire universe built by the author in which the characters are various species of forest animals, from mice to badgers to rats to hedgehogs to hares, etc. etc. Not only is it age-appropriate (mild violence, but no excessive gore or sexual assault) it's well written, expansive, and beautiful in a lot of ways.
The Redwall books are a series of children's fantasy literature about talking (and sword-wielding) mice, hares, badgers, otters, and shrews. The baddies are typically rats, foxes, weasels, and other stereotypically villainous woodland creatures. Lots of fighting, questing, and feasts. There's generally a riddle or two, some noble act of heroism from an unlikely character, and the good guys win in the end. They're meant for kids, but are fantastic reads at any age.
As for the non-children fantasy lit, The Bloody Nine is a character from Joe Abercrombie's trilogy The First Law. It's good fantasy but I didn't find myself rooting for any character all that hard by the end and that generally means I didn't love the books.
I absolutely loved the “Redwall” series by Brian Jacques and “The Alchemyst: Secrets of the Immortal Nicholas Flamel” series by Michael Scott as a young adult (still love them now) plus you’ll be set for the next few birthdays and holidays. They both have plenty of sequels in their respective series! (22 novels in the Redwall series and 6 in The Alchemyst series!)
Sell it, make some cash and buy this on kindle: https://www.amazon.in/Redwall-Tale-Brian-Jacques/dp/0142302376
Ok new one: my buddy suggested Redwall https://www.amazon.com/Redwall-Book-1-Brian-Jacques/dp/0142302376