Prologue: Broken Glass

Warning: This story is based loosely on The Cursed Child. I've changed the story everywhere it doesn't make sense. Also, I'm a big Nuna shipper, so in this story Alice Longbottom is Neville and Luna's daughter.
This is the events of The Cursed Child written from the POV of James Sirius Potter, well, sort of. I've wanted to do this for a looooong time...

James Potter is the oldest Potter of the generation. So, naturally, he's supposed to be Harry 2.0.
But when Albus, his younger brother (who's in Slytherin), steals a Time-Turner and goes back in time by a good two decades, will James remain the "perfect" Potter he seems?
Or will he just fall apart like his tangled mess of a family?