"The grand-paternal Aaronovitches came to England as Jewish refugees — "aliens" as the 1906 anti-immigration legislation called them — fleeing the murderous Russian pogroms. They scraped in just before the door closed on their kind. Aaronovitch's paternal grandfather drifted into the east London rag trade. Buttonholes were the illiterate old needleman's speciality. David's paternal grandmother spoke Yiddish all her life. The book's central focus is on David's parents. They are not, for him, mum and dad. He uses their first names — Lavender and Sam — throughout. It is as if he is holding them up with forceps."