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Tybalt is Juliet's cousin, originally, Tybalt wanted to duel Romeo instead. But since he and Juliet are married, he cannot fight Tybalt as he is basically his cousin-in-law, thus, Romeo rejects Tybalt's challenge. Mercutio finds this quite cowardly as a result he himself challenges Tybalt to fight.
Answer:
My father don't smoke but my uncle smoke too much .
She's able to be happy at some points. "Turning on the light upstairs" is a way to "turn on" happiness.
Bold best described the tone.