“What does Christmas mean?” asked Sven. “Father Christmas is coming” said the father without looking up from his cell phone. “No, Christ is born as a child,” Grandma said. “And which one of them is right, now?” asked Sven. “Then who is Santa?” Marie-Louise asked. She was only a little older than Sven but invariably thought she had to present her more detailed knowledge. “He’s called Satan,” corrected Grandma, whose view of the world was resolutely un-American. “He’s not called Satan at all!” “Santa and Satan are not the same, despite the anagram,” corrected Father and began to look up the definitions on Wikipedia. “I’ll show you right away.” His clumsy fingers slid over the smartphone and he frowned as if he had to thread a rope through the eye of a needle. “And what’s that about St. Nicolaus and his Krampus,” asked Maximilian-Alexander, who as a teenager felt too…