xzavier and mason ingle and their 9-year-old sister, alivia. an 11-year-old walking with them airlifted in critical condition. tonight, xzavier, mason and alivia s uncle says the family can t imagine life without them. he didn t lose one kid, he lost all of his kids. what do you tell your little brother, how do you tell your little brother it s going to get better? you can t. reporter: david, the driver of that vehicle that struck the kids is in police custody. she s facing a number of charges, including three counts of reckless homicide. david? alex, thank you. there is also a developing headline tonight involving the special counsel, robert mueller. tonight, there is word of an alleged plot to level accusations of sexual misconduct against him. were women offered money to make false claims? abc s chief justice correspondent pierre thomas reports tonight, it s now been turned over to the fbi. reporter: tonight, allegations of a possible smear campaign against special counsel