TRI-CITIES – Big Brothers Big Sisters of East Tennessee’s Greater Tri-Cities branch is looking for community volunteers to make a difference in a child’s life. Spending approximately four hours a month mentoring an at-risk youth can help improve their schoolwork, their behavior and their self-esteem. “We are looking for caring adults to be mentors to make a real difference in our community,” said Kathy Lowdermilk, Regional Director of BBBSETN.