As others here have said. Please get the gun to a qualified gunsmith who knows Parkers. After looking over the pictures you posted. I see several items that need to be addressed besides the dent in the barrels. By the looks of things the gun has been disassembled sometime in the past & several screws have either been lost or replaced by incorrect screws & that's only what can be seen externally, who knows what might have been done internally. One of the main issues I would have looked at is the fit of the stock to the action, if I'm seeing things correctly you may be missing both of the tang screws that secure the stock to the action or they may just be loose and need to be fit up correctly. The one thing your smith got right was to not shoot the gun until the proper repairs have been completed.
All of these issues can probably be addressed to bring your grandfathers gun back to the condition he would be proud of, but it will the take time, financial commitment & a qualified gunsmith who knows Parkers to do so.
Good luck & let us know how things go with this one.
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