Hi. I am on an extension of stay that is valid until the end of March 2020 (based on a non-imm F visa - working for the UN). My husband and my daughter have a single non-imm O visa based on being my dependants. We need to extent their visa - extended permit of stay based on being my dependants. What are the document requirements for this extension? (Having difficulty finding the list). And, their current visa expires mid of December. Can we apply for the extension of stay now or do we need to wait? (I.e. what's the timeframe one is allowed to apply for extension before expiry date?)