My husband and I created a family card game called PRIME. We recently launched a website to sell it www.PRIMEtheCardGame.com - after several years of development and testing. It's brand new on the market and it's fun and educational.
The deck is made up of prime numbers, bonus cards, letter cards and wild cards. The goal is to collect one of each number for your seven card hand. Each person has 7 turns so the game can be very quick - just one hand - or you can play to a point total - several hands. Each number card has a fun fact about the world: psychology, biology, math, geography, other cultures (often with humor). These facts are not integral to the game, but give you something to do (and hopefully a chuckle or two) while you're waiting your next turn. And, each number card has its number written in another language as well.
The best part about it is that kids can play at a kid level against grownups playing at an adult level -- and just as often the kids will win! We have a 6 year old, so that's a plus! Your kids are old enough to play at the adult level so maybe that won't be such a big draw for you.
The advanced version creates even more excitement because the letter cards give you special advantages. Strategy is a big part of the advanced version. We have played this game thousands of times and each game provides new and interesting challenges and outcomes.
The website has a couple of videos so you can see how the game is played before you decide to buy it. It's only $11 per deck and comes with a 30-day money-back guarantee, so there's no risk. If you try it, we'd love to hear your feedback!