Steve, I've spoken previously about sibling rivalry. It's perfectly possible that the reason June forged out such a successful career for herself was because she was trying to be as good as she may have seen Pam as being. It might follow that she felt the need to emulate her in all things. I would agree that 10pm is rather late to make a phone call but without knowing what may have been her usual practice, and taking harvest time into consideration as a possible variable, I can't make any further comment.
There was something going on under the surface. The Boutflours and Bambers rarely socialized together, which may have increased June's anxiety and increased the feeling of isolation among her children. It was Betty Howie who stood bail for Jeremy, possibly as a reaction against Robert's "
cuckoo in the nest" remark, which may have hit home to Betty, who herself was taken into the family by Auntie Mabel after her real mother died shortly after childbirth.