Question: what are the  first names of the kids in sound of music? 

Answer: According to IMDB, the characters are (oldest to youngest):\n\nLiesl von Trapp\nFriedrich von Trapp\nLouisa von Trapp\nKurt von Trapp\nBrigitta von Trapp\nMarta von Trapp\nGretl von Trapp
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