Authorities say a boy accused of killing four members of a Utah family surrendered peacefully following the Friday night slayings but has since refused to speak with detectives trying to piece together a motive. Police in the small town of Grantsville released the names of the victims Monday and said the boy was related to them. But investigators declined to specify the nature of his relation or release his name or age. The father of the family was released from the hospital after being treated for a gunshot wound. The killings were the first in two decades in the town of 11,000 west of Salt Lake City.