Jack The Ripper has these relationships to other tropes:

parents kids shares a parent with:
Stock Unsolved Mysteries
parent child
Stock Unsolved MysteriesWho Shot JFK
''Phlebotinum Killed The Dinosaurs
''Lost Roman Legion
''Jesus The Early Years
''Pyramid Power
''Roswell That Ends Well
''Bermuda Triangle
''The Tunguska Event
''The Men In Black
You'll need to Get Known if you want to add or modify these relationships.