under WA state family law can parents legally give up parental rights to child out of control child

I have a out of control son: My son will be 18 on Jan, 13, 2009. He has been in trouble with the law many time for abusing me and my husband. He torments our other children, and we have tried everything to help him, and spent $100,000 in a school for troubled teens and still we have had no success. Can we legally give up our parental rights to our child, and how do we do that. We live in Washington state - Is this your question? Add additional information