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Here is a solution for all you guys who are stuck on the part where Mrs Piedmont won't sponsor you because she says you could be a terrorist. I was stuck on this for ages myself but eventually figured it out.
When you have completed the LINC interface section for the first time i.e. collected the bust and completed the grid etc. then make sure that you use the magnifying glass on the 3 documents. If you do this the question marks will disappear. When you have exited out of the LINC interface, use the terminal which in the same room as the interface and go through your personal stuff under option 1. New details should appear about your history. When you have exited from the terminal you will notice extra dialogue which confirms you are Overmann's son. Go and See Mrs P and she should sponsor you now!
Phew!