Legal Question in Family Law in Washington

At this point, the best thing you can do is to file for dissolution of your marriage and file for a motion for temporary orders of child support and for a temporary parenting plan that precludes your soon to be ex-wife from allowing your son to be around her dangerous boyfriend. Once you have such a temporary order in place, then you can enforce your rights in this regard. Until then, your only other option is to obtain an emergency order of protection if she brings him around the boyfriend, but you will have only 2 weeks before you need to return to court and explain why the protection order should remain in effect. What a judge will want to see if that you've filed the dissolution paperwork and asked for temporary orders to deal with this situation in a long term manner.

Until you get some written court orders in place, you cannot have her arrested and there is no kidnapping charge available.

Last, a bit of advice. Your case as you have laid it out is not going to be a simple black and white affair. It will get complicated. If you can (even if you have to beg, borrow, or steal) get a lawyer to help you out. It may seem expensive, but considering all the pitfalls you would have to navigate on your own, this really is the best thing you can do for you and your son.