Answer:
See below.
Explanation:
The sentence is written in passive voice.
Passive voice means that a subject is a recipient of a verb's action.
Most sentences written in passive voice has "by" used in it. (E.g. The ball was thrown by the pitcher.)
-hope it helps
It foreshadows the outcome of the play. This is because it mentiones that they are dead. It allows you to guess what is going to happen next as both the lovers die and the families end their fued only after their children's death.