Authorities say the two boys lived together with their mothers, who are a couple, in a mobile home in north Florida. Around 4 a.m. Monday, a male friend staying at the home was awakened by the older boy and found the 4-year-old slumped over, unresponsive with blood coming out of his mouth, the arrest report said. The child's mother told investigators that she has had trouble with him for several years. When he was 4, he lit his crib on fire with a lighter. He also dug up their dead farm animals, cut their limbs off and carried them around, his mother said. Jones also said her son had been a victim and a suspect of sexually deviant behaviors several times and he had previously been caught choking another child. The young suspect had recently moved back to the home from a Miami rehab program, though deputies did not say why he was at the treatment center.