I hold a non-imm F visa which have already been extended up to March 2020 and now being extended again (extension of an extension) up to Oct. 2020. My husband and my daughter have a non-imm O visa based on being my accompanying family members which have been extended up to March 2020 (based on my previous extension). As soon as I get my new extension (the one up to Oct. 2020) can then also apply for an extension of their current extention (as they are linked to me) or - it's not possible for them to have an extension over an extension and thus need to go out an apply for a new non-imm visa o (again based on being my accompanying family members?). Hope it makes sense . Thanks for the help. Very much appreciated.