A Somber Wardrobe Requirement
Whenever a Royal travels, they must bring an all-black outfit. The reason for this is every family member must be prepared in case of a death. They need to wear black in order to attend a funeral. The rule has existed since the Queen was told her father died while she was in Kenya with Prince Phillip.
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Two Heirs to the Throne Cannot Travel Together
Those in line to succeed to the throne are not allowed to fly together. So, Prince Williams cannot fly together with Kate and their children. This rule was created due to air traveling being considered dangerous. Over the last few years, the rule has been relaxed a bit.
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