Possible Clues:

• Boy with degree in 13, but not first class
• Brazilian 102 Across
• Variety of 26+4 19D missile heads for battle areas
• 1930's Brazilian import
• Dance when Uncle gets a degree
• Originally African music Brazilians introduced to South America
• Latin step
• Mother is surrounded by sailors taking turn for a dance
• Brazil's national music
• Rio parade music