NEW : Rescuer : ` ` We have no idea how he ended up there by himself '' NEW : A woman is cradling boy in blanket , singing to him after rescue . Young Jacob , who was upstairs , was rescued ; search continues for his father , 3 half - brothers . Rescue team 's crew members said the boy was extremely brave under the circumstances .
NEW : Rescuer : `` We have no clue how he ended up there by himself '' NEW : A neighbor recalls cradling boy in blanket , singing to him after rescue . Young Jacob , who was upstairs , was rescued ; search continues for his father , 3 half-siblings . Rescue team 's crew chief said the boy was extremely brave under trying circumstances .