Tri-Town Youth Services, at 56 High Street in Deep River, will sponsor a discussion group for parents of teenagers. Discussion topics will include adolescent development, substance abuse, and computer safety, but the flow of conversation depends solely on parent interest. Guest speakers may be invited. The gruop runs for four Tuesdays: Dec. 13, Jan. 17, Feb. 14 and March 13. This free group meets from 7 to 8:30 p.m. at Tri-Town. All parents of teenagers are welcome. Please call 860-526-3600 to register.