The royal family is filled with rules, and one in particular might explain why Princess Charlotte is a princess, but her kids likely won't be.

When it comes to the British royal family, one thing is almost always true: they have a pretty confusing set of official rules and protocols. For instance, the royal family doesn't have a last name. And don't forget the fact that Queen Elizabeth celebrates two birthdays every year.

If your head isn't swimming yet, consider the tradition of royal titles. As a British custom, only the daughter of a prince or a prince's wife may be considered a formal "princess". The latter applies to Kate, who is both a princess and the Duchess of Cambridge thanks to her marriage to Prince William, the Duke of Cambridge. And their children, Prince George and Princess Charlotte, also bear official royal titles because their father is Prince William.

However, while Prince George's future children will also carry their father's royal status, any children that Princess Charlotte has will not automatically be considered princes or princesses. Why? Royal custom dictates that royal titles are passed down via sons, but not daughters.

"Royal titles are inherited through sons, so if Princess Charlotte has children they would not automatically inherit the titles (his or her royal highness) HRH, Prince, or Princess," Lucy Hume, associate director of etiquette experts Debrett's, told Town& Country.

Of course, exceptions can (and will!) be made. (Learn about every time the British royal family broke their own protocol.) The Queen has offered HRH status to other royal offspring in the past, including the children of Queen Elizabeth's daughter, Anne. Although Princess Anne and her husband, Captain Phillips, declined, perhaps Princess Charlotte will be extended the same offer when her own children are born.

【小题1】What’s the meaning of the underlined word “protocols” in the second paragraph?

A．Promise.	B．Behavior.
C．Manners.	D．Connection.

【小题2】What kind of child is regarded as "princess"?

A．The son of a princess.	B．The daughter of a prince.
C．The daughter of a princess.	D．The wife of a king.

【小题3】Who is Charlotte's father?

A．Prince George.	B．Elizabeth.
C．Prince William.	D．Captain Philips.

【小题4】What does the last paragraph mainly tell us?

A．Any person can break traditional rules.

B．Not every person must obey traditional rules.

C．Any British royal family member has their own title.

D．Maybe the British royal family will break their own rules.