I thought I would post this since I had never seen this discussed anywhere. My wife's father got issued a visa yesterday good for one year. I think my wife's mother will get one too, but there were some problems with her application that delayed it and it hasn't come through yet. The visa was based on my wife being pregnant, and I am not sure but I think also because of her parents ages, 68 for her mother and 78 for her father.
I don't know many details so I can't answer many questions, but her parents (and my wife too for that matter) were rejected without being interviewed for tourist visas in the past.
My wife is Colombian and she filed for the visas back in November.