I whistle beautifully. I keep up with fast movements by Bach and vivaldi. Mozart's usually a bit too complicated for whistling to though. I can't whistle loud enough to hail a taxi though. I also have quasi-perfect pitch. by that I mean if you ask for a C I can't just give it to you, but I can whistle the correct notes to any song without hearing the note first.
I have siblings. Of course I can whistle. It takes practice to annoy them. Lots and lots of practice.
i can whistle but not very loud, i definatly can't do the 2 fingers infront of your teeth thing, i'm more of a singing in rain whistle tune.