PONTIAC, Mich. — Opening statements begin Thursday morning in Oakland County Circuit Court for the nationally watched trial of the mother of the Oxford High School shooter where prosecutors will try to prove she was grossly negligent parent while her defense attorney will argue otherwise. A 17-person jury, which includes 12 members and five alternates, was finalized Wednesday after two days of questioning that focused on everything from gun ownership to parental responsibility. The mostly white jury is made up of 10 women and seven men who work in a range of jobs, including an engineer, hairst…