Angie, you've gotten some good advice from Faith.
I would add that most of the time they aren't supposed to take your income into account, but they do it in a sneaky way by saying that the bioparent's expenses are less because of the other household income and then assess him at a higher amount.
Also, if you have need to act on his behalf, look into getting a power of attorney. Your lawyer can help you with this and tell you exactly what it allows and doesn't allow. If money is an issue, go to a lawyer that offers a "free consultation" or free first visit. While you're there, ask about where the motions in the case have to filed.
I have also heard of stepmoms who blacked out all of their own information on the tax return when it had to be shown to the court.
And what Faith said about filing injured spouse to keep part of your return, that's good advice I hope you follow.
I understand how you feel about step parents having no rights. We are expected to care for the children but have no opinion about anything concerning them. Court decisions affect our lives and finances and we can be named in court papers (as in "stepparents shall not....."), but we are not allowed to speak in mediation or have our wishes heard. I wish there was something we could do, but for now, there isn't much.
