Congrats to your son. And I’ve seen more than once on “Pawn Stars” or whatever that show is when someone brings in a shiny gun or sword they say “It’s pretty well damaged now that you shined it up....”
Although I imagine you aren’t doing it for the money. How about leave them as they are, and put the effort into a nice little display frame he can hang on his wall. Along with maybe a photo of grandpa?
Oh, and maybe a description or a copy of the citation on the rear. I have some old ribbons and of my dad’s (WWII), but heck if I know what they mean now!