>> but elizabeth didn't like this idea. >> i don't have anything to say to her. because it doesn't matter what i say. it's like she's not going to change. she's not going to tell all these people that she lied. >> in the years following their father's death, joan shannon's two sons, david's sons, were living in north dakota and grew up in the major's boyhood home here. his mother became in joan's absence their mother and grandmother. the boys believed in joan's innocence, visited her sometimes, and talked to her on the phone. they were not speaking to their sister. and major david shannon, his remains will spend eternity here just down the road from home in the old military graveyard under the black prairie sod and the wind. >> that's all for this edition of "dateline extra."