Who is Delvin from Neither Wolf nor Dog: On Forgotten Roads with an Indian Elder and what is their importance?

Delvin is the name of Danelle's husband, who was in his late thirties and wore jeans, a white T-shirt and cowboy boots. He drove up with her and their three kids. Delvin and Nerburn introduced themselves to each other. Delvin asked Nerburn if he was writing a book and began to tell him about the family history. Delvin said Dan was Danelle's grandfather. He continued to reveal the rest of the story to Nerburn until he heard Danelle's voice shout okay when he changed the subject, whistled and tried to act nonchalant. She asked if he got it all, meaning the water and how long it would last, but Delvin misinterpreted her comment to mean the story about her family.