M.M.
Mine joined the Navy. Thank God.
We had to be VERY consistent.
We removed doors and changed locks to the outside.
We removed all extraneous items from his room, the only thing he had were books, his bed and a dresser with clothes.
We had no cable for 17 years. Things he saw would only incite him more.
We locked the computer with passwords he could not spell.
He didn't get a license until he was 17.
No phone until his 18th birthday, no computer of his own until then either.
He had minor brushes with the law and I had to let him pay the price.
We had a very strong youth group, this helped tremendously.
His job also helped, he made pizzas.
I cried myself to sleep more times than I remember because of him but he has done very well in the Navy. He finally wants it.
He failed everything at school on purpose or did the absolute minimum.
Separate the girls. Put them in separate rooms with nothing. they get nothing until they deserve it. Sometimes this includes dinner, they can eat in their rooms and it can be bread and water.
I send you strength and prayers and a huge cyber hug. There is not much more devastating than a psychologist giving you an ODD/CD diagnosis. But it can be managed.