Now the Royal family faces TV 'Nazi' exposé: As Palace considers legal action over 'Hitler salute' photos, Channel 4 documentary is set to reopen a painful chapter of Duke's family history

• Buckingham Palace bracing for new revelations in Channel 4 documentary
• It comes amid furore over footage showing Queen performing Nazi salute
• The programme will reveal details of Prince Philip's sister's marriage
• Three of his sisters, including Sophie, were married to senior Nazi officers

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