Can a drug addicted mom “kidnap” her kids?

My brother and his wife have been split for some time due to her meth addiction. She uses needles. He has had his kids her in Washington state and then just recently tried to bring his wife here to try to help her get clean. He left to go to Alaska and send their stuff back down here and while he was gone she took his truck and the kids. What can we do now?

More Meth Drug Addiction Info: