"WEST POINT" Utah (ABC 4 Utah) - A fifteen year old is in juvenile detention after being questioned for the deaths of his two brothers. Thursday night, reports are saying that their mother found her four-year old dead inside their home. Police say she couldn't find her other two sons when she contacted authorities. Davis County sheriff deputies later found the ten year old dead inside the home. "It appears they had a knife like wound," says Sheriff Todd Richardson. Richardson says the 15-year old ran from the home but Layton police found him shortly after midnight. "He had some wounds," says Richardson . After being questioned, Richardson say's that he has been booked into a juvenile facility in Davis County. "He acted alone," he say's. "There are no others at large. Lindsey Caballero says she often spoke with the mother of the boys. "I've talked with their mother many times but I never got the sense that there was this kind of trouble," says Lindsey Caballero. Caballero goe's on to say that the two brothers who were killed were adopted and the 15-year old is the real biological son. Reports say there are also three other siblings who were not home at the time of the deaths. "You could tell there was a sibling rivalry between the biological son and the adopted boys," she says. "But I never imagined it could go this far." Police say prosecutors will be screening the case against the 15-year old who will be charged in the juvenile system.