trayvon martin's mom and older brother taking the stand this morning. she was the first to take the witness stand and she was asked about the anybo911 recording ta the night her son was killed. >> do you think they're yelling help? >> yes. >> what is your -- >> there's gunshots. >> you just heard gunshots? >> yes. >> ma'am, that screaming or yelling, you recognize that? >> yes. >> and who do you recognize that to be, ma'am? >> trayvon benjamin martin. >> that was sybrina fulton. she's been called back to testify once again. let's listen in. >> do you recognize this button here? >> yes. >> is this a button your son always wore, mr. trayvon martin always wore?