I'm guessing at the relationship in the title. The main owner is "J.Ostrowski", the writer is "Uncle John", the nephew is "J. Ostrowski" (called "Chiz" by Uncle John). Of course, the nephew - an Army private in WWII-ravaged Wyoming - could be the owner, but he'd be kind of an old private because the other owner would be his son, according to the card, making "Uncle John" way older.
CLICKit!