Prince / Princess

It refers to the non-reigning siblings of a King or Queen or the King or Queen and King Consort or Queen Consort's children other than the heir.
  The title sometimes also comes with a number if there are many children, such as 'Second Prince' or 'Third Princess', 'First Prince' and 'First Princess' only being used for the Crown Prince or Crown Princess.
Type
Royalty, Household
Status
In use
Form of Address
His Royal Highness / Her Royal Highness ; then Sir/Ma'am
Equates to
Current Holders
Reports directly to