Good man! Your daughter will probably appreciate it. My father sold the guns my grandfather had from WWI, to include 3 Lugers. I still give him a hard time for it.
Welcome to the S&W Forum... I doubt you will find anyone here who seriously suggests you should sell that obviously desirable family heirloom. I certainly vote to keep it too, but would add the suggestion that you write down all you can remember or find out about the gun’s history in your family and your grandmother’s interest in guns. Your family will be a lot more likely to continue to value the gun and will thank you for it.
I have a couple of family guns that date back well over a hundred years in the family but got them with only oral traditions and I can’t go back and double check my 70 year old Froggie memory.