Simplify the following text for a Grade 11 native English-speaking person.
Original: The only current grand ducal family in existence , the Grand Ducal Family of Luxembourg , styles its junior members as `` Royal Highness '' , but this is due to their additional titles of Princes of Parma , although this title was relinquished in 1995 .
Simplified: The only current grand ducal family in existence , Luxembourg , styles calls its junior members Royal Highnesses , but they were also Princes of Parma .