So? Could be it's an example of how the relationship stood between father and son. Could also be that both JB and June DID know if there's only JB's word for it that they didn't.
Because I believe JB over others it's not difficult for me to say that he hadn't known about the land,nor would June have known either as it had been a late transaction when June had been more preoccupied with her own health in paying regular visits to her GP.
How would anyone have felt being given a piece of land when suddenly the thought that it could be snatched from under them was a reality ?