Step Siblings

Allee FIsher is pretty much just a normal 15 year old girl living with her mother and her little brother regularly. Allee's mother and father recently got divorced. Allee and her brother Mark see their father on weekends. Allee is just living her life when one day her mother takes her and her brother out for a fancy dinner date because their mother has a surprise for the both of them. They have no idea what they're in for, their lives are about to change when their mother reveals a secret... (Don't want to give to much out)