There are two types of NF waivers: type 1 and type 2. Type 1 waivers are for the easy stuff, like having too many parking tickets. Type 2 waivers are for more complex categories, like citizenship, and have to be seen by more (and different groups of) people. It is the category of waiver, citizenship, not the ease of coming to a common sense conclusion (you were only 4 months old at the time), that determines how long these things take.
Thanks to the Walkers, and others, it is known from experience that family connections can be powerful motivators for folks to do bad things (like give away secrets). Citizenship issues are treated very seriously. I knew of guy (long ago) who was denied, from similar circumstances, because he had an uncle who still lived in Russia. Unfair? I thought so at the time, but history is a teacher whose lessons are hard, and like most areas of nuclear power, it's usually better to fail on the conservative side.