Romeo and juliet when the sun sets the air doth drizzle dew capulet assumes his daughter is crying for

The question refers to Shakespeare's Romeo and Juliet.

When Capulet says the words " "When the sun sets, the air doth drizzle dew" ... he follows it by "But for the sunset of my brother's son ... " - which shows is that he means his brother's son, Tybalt - that is the correct answer. Although he is not happy she is crying, he is satisfies that the reason is proper - she is allowed to mourn Tybalt.