What a pity if your kids stop learning Chinese, It's not easy for them keep learning Chinese for so many years , let them continue to learn through the network, just learn Chinese and speak Chinese 30min a day .

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I would suggest looking for Mandarin programs in your area via online. Some times your local universities will offer a program even for children. If you've moved somewhere with a large Chinese community they might offer some form of Chinese school as well. I hope in someway that this was of help. Best of luck, really great that you want to help tjem continue this, hopefully you find what you're looking for!

好样的！可以通过网络继续学习，不要停下，不坚持就太可惜了。 Well done! Can continue to learn through the network, do not stop, do not persist is too bad.

The best age to acquire a language is under 12. So immersion program can help kids to learn a language at their natural habit. I think they need to continue learning languages. Though they don't have immersion program, kids need some language environment. There should be some Chinese schools around many areas, you can look for them. For summer, you can send your kids to some summer program.