New Old and Now

fifteen year old's Olivia and Zach lost a parent each but then their parents found each other. Olivia and Zach have the same birthday down to the minute so when they move everyone thinks their twins and they even act alike, but their bond decreases greatly when Zach meets Tyler. The boys hang out more and more but on Zach and Olivia's sixteenth birthday. Tyler confesses that he has a crush on Olivia. With her over hearing this and her brothers reaction what will she do when she likes Tyler as well.
Can new and old be together without losing present?