| Quote #1
Two households, both alike in dignity,
In the Prologue, the Chorus tells us that Romeo and Juliet is a play about domestic conflict. "Two households" (that would be the Montagues and the Capulets), "both alike in dignity" (of the same social standing) are going to be involved in a rather messy, and uncivil family feud. Keep reading…
| Quote #2
[…] From forth the fatal loins of these two foes
Here's a little more background for us: children from the feuding families are going to meet and fall in love, putting an end to their families' strife—in the most tragic way remotely possible.
| Quote #3
Juliet struggles with the conflict between her feelings for Romeo and her knowledge that he is an enemy of her family. She tries to separate Romeo from his identity as a Montague, and contemplates deserting her family for him. She does not imagine that their love and their families' opposition can be reconciled.
Pro tip: When Juliet asks "wherefore art thou Romeo," she's not wondering about Romeo's physical location. "Wherefore" means "why" so, Juliet is basically asking why the love of her life has to be Romeo Montague, the son of her family's enemy.