What are the motifs in The Guernsey Literary and Potato Peel Pie Society by Mary Ann Shaffer?

Family is a recurring idea in the story. Nearly every character has lost at least one important family member, mostly due to the war. Juliet was orphaned when she was quite young, and her great-uncle sent her to boarding school where she befriended Sophie, and through her, Sidney. Elizabeth was orphaned when she was young, and Sir Ambrose, her mother's employer, raised her. Dawsey's father died when he was twelve years old, and his mother went mad until her death shortly before the war began. Eben sent his grandson, Eli, to England when the children were evacuated to England during the war for their safety, and Eben will never forgive the Germans for making him miss Eli's childhood.