No, he has a brother Doug and a sister Julie Neal.
No, I am pretty sure they are not. Pitt and Pitts isn't even the same last name
Although they both share the same last name, Michael and Brad Pitt are unrelated - At least not related going back 2-3 generations, other than that they may be related.
Yes. Brad Pitt has a brother, Doug, and a sister Julie.
Yes. Sig Chi