Is it that one hatt family members that's a banker, the military woman that replaced the guy who was rude to Andrew and his girlfre-i mean, Molly?
These guesses are getting closer, but still not quite! It's not Richard Hatt, nor the female military officer.
Oh, and don't think that I didn't notice your little 'slip up' XD
Is this peak fanfiction author? To have your OC shipped with a canon character? I think it might be, but then again I'm not sure. That's a question only the fanfiction gods can answer.