As for your moral dilemma, to keep or not to keep, since that is the question, I'd say keep!
But I have a soft spot for multi-generational considerations, and consider what it would mean to your kids one day to have their great grandfather's rifles to go shoot! I know that would mean a lot to me as well as my kids.
Although I don't have any firearms from my ancestors, I do have knives, and old desk, and pictures. My kids love them, as it provides a tangible connection to a generation who, for the most part, checked out before they were born.