( CNN ) -- The former stepson of singer Usher Raymond remained in critical condition in an Atlanta hospital Tuesday , four days after he was injured while riding in an inner tube at a north Georgia lake , his family said . A personal water craft crashed into Kile Glover , 11 , and a girl as they rode on an inner tube that was being towed by a pontoon boat in Lake Lanier on Friday , according to an accident report from the Georgia Department of Natural Resources . Kile suffered a serious head injury and was flown by helicopter to Children 's Healthcare at Egleston Hospital in Atlanta , it said . The 15-year-old girl , who was not identified in the report , was also taken to the hospital . Her condition was not made public . Usher 's view from the top of the charts . Jeffrey Hubbard , a 38-year-old Atlanta man , was driving the personal water craft , the investigation report said . Investigators concluded that alcohol was not involved in the incident . The family has held vigil at the hospital since Friday . Usher visited Kile early Saturday morning , but has not returned , according to a source close to the family . `` We know God 's in control , and are leaning on our faith in Him and His word at this most difficult time , '' his family said in a statement to CNN Tuesday . `` We firmly believe in the power of prayer and ask that you all continue to pray and lift Kile up , as it 's the best way we can all support him now . '' Usher continuing Michael Jackson 's legacy ? Kile 's mother is Tameka Raymond , who was married to Usher for two years until their divorce in 2009 . The couple have two sons together , ages 3 and 4 . Kile 's father is Ryan Glover , the president of Bounce TV , a fledgling television network targeting African-American audiences . He is also a former executive with Turner Broadcasting , the parent company of CNN . Tameka Raymond on life after Usher . CNN 's Dave Alsup contributed to this report .
Ryan Glover , however , suffered a serious head injury when a jet ski hit him Friday . Usher was married to Kile 's mother and is the father of his two young children . ` ` We know God 's in control , '' Kile 's family says . The child 's father is Bounce TV President Ryan Glover .