Who Broke The Window Mystery

Riddle

One snowy night Detective Mehul was in his house sitting by a fire. All of a sudden, a snowball came crashing through his window, breaking it. Mehul got up and looked out the window just in time to see three neighbourhood kids who were brothers run around a corner. Their names were John Crimson, Mark Crimson and Paul Crimson.

    Mark Crimson "?" = question MARK, so the note on the door reads "Question Mark Crimson broke your window."