Sorry for the English! We just returned from 3.5 years in Amsterdam where my kids (10 & 13) attended Dutch school. As they're almost fluent (and worked really hard for it), we'd like to find them some sort of support so they don't lose it.
Whether it's via classes, or if there's a kid-friendly conversational group, I'd love some suggestions. Please let me know if you are aware of either. (Or, if you're a tutor...) The tiener has already switched the electronics over to Dutch to "keep up". ;)