Who is Giuseppe and Nora (Almigia) Ramundo from History: A Novel and what is their importance?

Giuseppe and Nora (Almigia) Ramundo are Ida's parents. The Ramundos baptize their daughter Iduzza (Ida) as a Catholic. Nora suffers from mental difficulties, and her husband is a radical anarchist. Nora was raised as a Jew but denies it vehemently to everyone but her family.