What is the fine-grained topic of the following text: Raised by his aunt Mimi (Kristin Scott Thomas) since he was a young boy, charismatic 15-year-old John Lennon (Aaron Johnson) is suddenly reunited with his mother, Julia (Anne-Marie Duff), which ignites a bitter battle between the two sisters for John's affections. Only return the topic.
John Lennon's early life and relationship with his mother and aunt.