I am not so sure what you are asking
Based on the given sentence above, the appositive phrase here is the "triplet sisters". When we say appositive, this is a word or phrase that renames the subject that follows it. In this case, this appositive renames <span>"Laura, Lisa, and Lynn". Hope this answers your question.</span>
I told u the answer in the comments
This is an instance of dramatic irony, taking into account that this figure of spech is when the implications of a situation, speech, etc, are understood by the audience but not by the characters in the play.
