My 3 sons were seriously injured in a car accident when their grandmother was driving. She was killed. The police report determined she was at fault . The report said the tire tracks on the road showed she crossed a double line into an oncoming dump truck. There were no witnesses. The dump truck driver corroborated the police report. My insurance company and my mother in laws insurance company paid a settlement to our family for my children's injuries and to the dump truck driver for his injuries. I signed a claim settlement saying I would not further sue my mother in laws estate. However, I believe the dump truck driver was at fault. I also believe we have new evidence to prove this. If I can can get a confession from him is there a chance to sue his company's insurance company or him?