The theme of familial love is developed across act II, scenes I–III through Romeo and Juliet’s dialogue. While Romeo and Juliet know that they can’t stop loving each other simply because of their families’ hatred, they both are tormented at the thought of being in love with the enemy. They know that in giving in to their love for each other, they are being disloyal to their families. Juliet wishes that Romeo would change his name for her love. Yet, she also contradicts her own loyalty by admitting that she’s willing to stop being a Capulet for his love: O Romeo, Romeo! wherefore art thou Romeo?
Deny thy father and refuse thy name;
Or, if thou wilt not, be but sworn my love,
And I'll no longer be a Capulet!

The hatred between their families forces Romeo and Juliet to keep their love a secret. Juliet knows that if her family finds out about her love for Romeo they will kill him. Romeo remains willing to risk his life for their love:

JULIET: How camest thou hither, tell me, and wherefore?
The orchard walls are high and hard to climb,
And the place death, considering who thou art,
If any of my kinsmen find thee here.

ROMEO: With love's light wings did I o'er-perch these walls;
For stony limits cannot hold love out,
And what love can do that dares love attempt;
Therefore thy kinsmen are no let to me.

For their own safety, Romeo and Juliet decide to get married in secret, hoping that their marriage will bring their families together. Friar Laurence, who agrees to officiate their secret wedding, also hopes that their love will erase their families’ hatred:

But come, young waverer, come, go with me,
In one respect I'll thy assistant be;
For this alliance may so happy prove,
To turn your households' rancour to pure love.