GRAHAM, Wash. — Days after a judge ruled against him in a child custody hearing, a father of two young boys apparently blew up a house Sunday with all three inside — a tragic ending to a bizarre, long-running case that began when the man’s wife went mysteriously missing in Utah. A Child Protective Services worker brought the two boys to Josh Powell’s home for what was to be a supervised visit, and Powell let his sons inside — but then blocked the social worker from entering, Graham Fire and Rescue Chief Gary Franz told the Associated Press. The social …