The Bangor Daily News says the boys told detectives they were forced to punch, kick and knee each other on Jan. 9 at Delgado-Bristol's Rockport home. The boys also told investigators Delgado-Bristol hit the younger boy with a sandal when the boy refused to fight any more.
The boys' mother saw the injuries and reported the father to authorities.
A judge called Delgado-Bristol's actions "depraved" and barred him from having unsupervised contact with either boy.
