The crossword solution for the term 'Cousin of Why' is 'How', with three letters. The phrase 'Cousin of Why' is a rhetorical question, which is a figure of speech used to make a point or ask a question without expecting an answer. It is often used to emphasize a point or to express surprise or disbelief. In this case, the phrase is asking how something could have happened, as if to say 'Why did this happen?'