Question for gun owners/enthusiast?

[sbfinley]

I recently inherited, among other things, some handguns and rifles from my father. My mother didn't want them in the house with my 14 year old brother and my sister and her fiance have no use for them. The rifles for the time being will stay with my father-in-law as he is an avid hunter and has several gun safes. However, the one I would like to keep is a Ruger Police Service Six .357 Magnum. The problem is he inherited it from his father and it has no paperwork or permits whatsoever. I know absolutely nothing about guns (I had to take them to a friend to be sure they weren't loaded) but I would like to keep this one in particular because of the family history.

Is it possible to get the required paperwork now that it has passed down to me? Or will they assume it's stolen if I waltz into a gun store trying to get it registered? If it helps I live in the state of Tennessee.

Thanks ahead of time.