The major chords are important in 'chords the story' as they often represent the positive and stable elements of the story. For example, a C major chord can be like a happy beginning or a moment of resolution. Minor chords are also crucial as they can convey the sad or tense parts of the story. The dominant chords are significant too as they create a sense of movement and lead to other chords, much like a plot device leading to the next part of the story.
I don't think it's purely based on a true story. It might draw some inspiration from real-life situations but has been fictionalized and dramatized for entertainment purposes.
It's hard to tell. 'Our Father' could have elements of real events mixed with creative imagination. Maybe it's based on a loose real-life inspiration but not a direct account.