Since we don't have a formal curriculum for Chinese right now, I've been looking into YouTube videos. There's a wide assortment of channels available, but the ones I've found that seem most friendly to beginners and have a whole series of tutorials (though not necessarily 'kid-friendly') are:
Learn Chinese with Chinese101 - This has a wide variety of video series, such a Chinese Holidays, Chinese in 3 Minutes, Weekly Chinese Words.
Yoyo Chinese's Beginning Conversational Chinese - This teaches basic conversational Chinese. This is VERY basic, starting from 'Ni hao'.
Yoyo Chinese's Intermediate Conversational Mandarin - A step above the Beginning videos. They also have many other series, like Grammar. She covers alot of basis sentence structure and word order. The videos are less than 10 minutes long, usually 4-5 minutes.
None are really aimed at kids, so kids don't find it fun or exciting, but I think the content is decent, and they are produced by native Mandarin speakers (which also means they speak English with a Chinese accent, but their English is fine.)
As I find for more, I'll add to this list.