Which flag

[Spartan Tartan]

I would keep your flag for your shadow box. I would also make a shadow box or some display for your grandpa using his flag.

I have my grandpa's flag sitting about 2 feet behind me in my office at this very moment. It is the first and most prominently displayed item in every office I have ever had and will continue to be so in the future. I still have the shells folded into the flag from the 21 gun salute at the funeral for my grandpa. The flag sits in a box alone with an inscription dedicated to my granpa.