Batutta
Major Contributor
Unless I misinterpreted something, the book has it as they are not cannibals and are there to take care of him. And having read the book, I have trouble interpreting the film in any other light. This scene or any others.
Perhaps the guy lost his fingers fighting off someone for food or supplies?
I thought it was clearer in the book, but then I just reread it, and it's just as slightly ambiguous. The dialogue is almost word for word the same, too. I'd say it definitely tilts into the hopeful camp with the presence of the dog and kids. Also, the dog was a nice touch because it was probably the same dog that was barking over the bomb shelter. If the father hadn't been so cagey and stuck around they probably would have hooked up with that other family.