In Washington, income earned by either party during the marriage is community property. There is a presumption that community property will be divided 50/50.
I would file a motion for contempt for failure to follow the parenting plan. In your declaration, I would state that your days were changed by agreement and that you two followed the new schedule for however long. You will also want to state how the mother has kept you from the child or otherwise failed to follow the plan. Remember, you need to get an order to show cause signed and have the mother personally served with the motion and the order.
First, the child support order can be written so that payment is made directly to the other parent instead of through the State. This is not the preferred way because there is no one keeping track of the payments. But it is easy enough to choose that option. Second, it is mandatory that the parents pay child support. Even parents who are not working have an obligation to pay support. Saying that, there are ways to get the amount lowered. The court will grant a deviation under certain...
If you can prove that she is exposing your child to these things, then I think a court is going to take a very hard look at the mother's home. You should be prepared to show that your home is stable, that you are available to care for your son's needs, and that you have taken an active role in your son's life in the past. The courts like stability for children. They are likely to leave the child where he is unless you can show a really good reason why he should be moved and that your home is...
It depends on your state. To find a family law attorney in your area, try the local county bar association. They often have a lawyer referral service. These are attorneys who offer a low cost initial consultation.