Why does Megan need to curtsy to Princess Kate after marrying the British royal family?

Because this is the custom of the British royal family since ancient times, traditionally, an ordinary lady has to curtsy to someone who has a higher status than herself and a royal title, and Megan's status is only a little lower than that of Princess Biket. So this is actually the courtesy of the British royal family, which is why we all need to curtsy to Princess Kate after seeing Megan join the British royal family.

But in fact, curtsy is an unnecessary etiquette now, but it must be done between members of the royal family or on formal occasions, especially in front of the queen. On the other hand, Megan is a new member of the royal family. The people she wants to pay tribute to are the Queen and Princess Kate. Because Princess Kate belongs to Megan's eldest sister-in-law, we must salute Princess Kate.

In fact, the British royal family has some strange behaviors. For example, Megan doesn't have to salute alone like Princess Sophia, the wife of Prince Edward. But if Prince Edward is with Sophia Faye Wong, Megan needs to salute. Therefore, in fact, a man of royal descent can make his partner's position more stable, but also improve his partner's own position. But if there are two pairs, and the man in one pair is taller than the other two, then the man has to salute with the other half.

These things are all polite ways to show your identity. This way can be said to be a tradition handed down from Britain, so it has been used until now, which means that Megan needs to curtsy to Princess Kate after she marries into the British royal family.