Cassandra Grammel, 24, allegedly ran a red light and knocked down a couple and their two children in Delray Beach, FL and fled the scene.The husband suffered a broken leg and cuts to his head. The wife suffered a concussion. The two children - a 4-year-old girl and a 1-year-old boy, were uninjured. Grammel's crashed car was found nearby.A police dashcam recorded her tearful arrest and apology.