ELI5: Explain Like I'm 5

Royal intermarriage

Royal intermarriage is when members of one royal family marry members of another royal family. For example, Prince Harry, who is part of the British royal family, married Meghan Markle, who is part of an American royal family (the Markles). Royal intermarriage is done so the two families can be connected and related, like joining two big families together. It's like two families becoming one.
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