An attorney for Kim Zolciak and Kroy Biermann’s 15-year-old son, Kroy “KJ” Biermann Jr., has broken his silence on accusations that the teen engaged in sexual activity with a family member under the age of 12. “The characterizations made in court regarding the prior juvenile matter involving KJ Biermann grossly misrepresent both the facts and the ultimate resolution of that case,” KJ’s lawyer Jason Sheffield told TMZ on Friday, September 11. “The matter arose from inappropriate, crude behavior involving two middle-schoolers.” During his bond hearing on Friday, September 11, Page Six reported that prosecutors allegedly found video…