Unfortunately I can't think of any quotes at all that suggest that Romeo and Juliet were ignorant of the feud. On the contrary from the very beginning it is clear that they are completely aware of the feud and what an important force it is in their families, and how unfortunate it is that they have fallen in love with one another because they come from the two feuding families. Note for example their reactions in Act I scene 5 when they discover the identity of the other. Romeo says:
Is she a Capulet?
O dear account! My life is my foe's debt.
Whereas Juliet says, upon discovering the identity of Romeo:
My only love, sprung from my only hate!
Too early seen unknown, and known too late!
Prodigious bith of love it is to me
That I must love a loathed enemy.
One of the aspects that makes this such a tragic play is that the two lovers are completely aware of their situation and the situation of their families throughout the entire tragedy. They are never and can never be ignorant of it for one moment.