In Romeo and Juliet, how do both of Romeo and Juliet find out that their families are enemies?In my book about Romeo and Juliet, its written: when...

In your text, it reads "when the young lady was called
away to her mother, Romeo asked who her mother was." This is a little confusing since
the "her" that Romeo addresses is unclear. However, in the original text (Act I, scene
5) we see that Juliet is called away by her nurse; this is the woman that answers
Romeo's question revealing Juliet's identity. In the same selection of the original
text, we see that Juliet also questions her nurse and is informed of Romeo's identity.
Thus, both Romeo and Juliet found out that their families were enemies by questioning
Juliet's nurse.