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Hi and welcome to JA. Ray here to help you today.Please bear with me a few moments while I review your question and respond.
Here the ex husband if he signed the birth certificate is the legal father and is legally obligated to support the child and have visitation.You would be able to file with the courts for such support.He certified he was the legal father and the law consider him such with obligation to support the child under the law.
He has right to claim to be parent and did do , legally he is required to support the child since he signed the affidavit of paternity and birth certificate.
If you are wanting child support you can file here through the state.
He didn't do anything illegal here he voluntarily claimed paternity.
I appreciate the chance to help you today.Please let me know if you have more .Thanks again.