What did Winnie and Miles talk about when they went fishing?

While fishing on the pond, Miles told Winnie about his son and daughter. She asked why he never told them about his condition and never looked for them. His answer was that it was best this way. During the conversation, Miles handed Winnie a fishing pole. The pole jerked in her hands and then went slack. Miles continued with his tale about how his daughter would be about eighty now and his son would be around eighty-two. He also explained that he wanted to do or find something important one day. Winnie had the same dream and identified with him.