What are some good quotes that represent the theme of parental love in Romeo and Juliet, particularly in Act 2?
This is a good question but a bit tricky. It is Juliet's Nurse who offers the best example of parental love even though Juliet is not biologically her child. The Nurse protects, dotes, and loves her charge with a zeal Lady Capulet has never expressed for her daughter.
For example, when Romeo begins to make noises about his infatuation, the Nurse is the first to test and challenge his intentions. She warns:
"....But first, let me tell ye, if you should lead
her in a fool's paradise, as they say, it were a very
gross kind of behavior, as they say; for the
gentlewoman is young. And therefore, if you should
deal double with her, truly it were an ill thing to be
offered any gentlewoman and a very weak dealing" (2.5.152-167).
The Nurse also shows her long-term love for Juliet in a maternal way. Her continued desire to protect the young girl and wish to see her happy seems motherly as well. Continuing her conversation with Romeo, the Nurse tells him,
"Well, sir, my mistress is the sweetest Lady. Lord,
Lord! When 'twas a little prating thing -- O, there
is a nobleman in town, one Paris, that would fain
lay knife aboard; but she, good soul, had as lief see
a toad, a very toad, as see him. I anger her some-
times and tell her that Paris is a proper man,
but I'll warrant you, when I say so she looks as pale
as any clout in the versal world" (2.5.195-202).