I am not sure if that would matter but I read somewhere that it has to be for a reunion which means visits or short stays might not be a priority.That's nice atleast they responded, in my case i did not hear anything since 8th Dec, I have a TRV so does it matter it I want to go there 6 months and less? Since they didn't specify it thats a requirement to get the authorization. It is just that you have to be an immediate family member and apply regardless of the duration of stay.