Sherlock Holmes

Sherlock Holmes

One snowy night, Sherlock Holmes was in his house sitting by a fire. All of a sudden a snowball came crashing through his window, breaking it.
Holmes got up and looked out the window just in time to see three neighborhood kids who were brothers run around a corner. Their names were John Crimson, Mark Crimson and Paul Crimson.
The next day Holmes got a note on his door that read "? Crimson. He broke your window."
Which of the three Crimson brothers should Sherlock Holmes question about the incident?