My uncles, brother in law

18 almost finished year 12 and loving life. Becca adores her uncle and five year long fiancé who are both pushing 36. Just the same she loves the playful relationship she has with her new aunty's younger brother. He two years older then her and is always getting on her nerves.
What happens when they begin to spend time together before the on coming wedding. They will officially be family but emotions comin into play how will their family react when everything unfolds