It's hard for me to speculate on this, MelodicMelody, because I think it could be many things. I must confess that I do the things you describe your brother as doing, but I don't have Tourettes. I have bipolar disorder, but most people I know who also have bipolar disorder do NOT do these things. In my case, I think it's a little my personality, a little my sense of humor, a little related to self comfort, and maybe something else.