My lessons could be aimed for both: kids (through games and creative learning) and adults (through conversation and reflection).

I would try to use the same methodology I have used in my past: exchanging a lot of information, sharing stories and engaging with them it's key in order to learn much more than a language. Each lessons needs to balance concentrated (grammar or vocabulary mainly) work with some moments of pause were the student can relax while still learning and being in contact with the language.