This is a no magic setting.
Emma swan was adopted by Mary Margret and David Nolan when she was 12 years old. She is now 16 and just going into junior year. She has the best friends and an amazing boyfriend.
Killian Jones is Emma's boyfriend and both his parents died when he was little. His brother joined the Navy and sends money to him every so often. He is 17. He is friends with the Emma's friends and they are all tight.
Regina Mills and Zelena Mills are sisters. Zelena is 18 and Regina is 17. Zelena is in senior year where Regina is in junior year with all their other friends. Zelena is dating Hayden Olympian (Hades) and Regina is dating Robin Locksley.
Belle French is another member of their group. She loves to read and lives with her father. Her mother passed away when she was 14 but no one remembers not even Belle, who was there. None if her friends know this but she has a secret relationship with their history teacher Robert Gold.
Elsa Frost is the last member. She, unlike everyone else, is single. She has a little sister called Anna Frost. Her sister is in freshman and is 14. Both their parents died in a boating accident and they live with their Aunt Sarah Fisher who owns the local ice cream shop.
[I own nothing by the way.] :)