You need legal representation immediately. You need to defend the OP and you need to get your children. She most likely may be using the OP to try to keep you from you children. They belong with their mother not step mother. You should get to a lawyer today. In the meantime a relative like your parents or sibling should seek guardianship as an emergency in court. This is very complicated. Be sure to get a lawyer or you could lose your kids.
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You definitely need to fight the OP action. Please hire an attorney to help you. Having an attorney there may cost money but will be more than worth it due to the support and experience the attorney brings to the table. Also, the cost will be trivial compared to the value of having your kids available to you.
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