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Thank you for your question. Please permit me to assist you with your concerns.There is no one thing to file first as you have quite a few things to file. You would need to immediately file the forms and petitions for divorce, and attach to it a motion for emergency child support and spousal support for your own child. Then, you would also need to go to court and file a motion for guardianship of the step-child (if the other parent is likewise not involved in the raising of this child). Only when that guardianship is granted can you amend your request for child support and seek support for both children, as legally you can currently only collect for one. Also please collect all document,s all forms, EVERYTHING pertaining to finances so as to create a paper trail and then demand an equal portion of the estate once the dissolution is granted. Hope that helps.