As the mother you should have custody already. You also can try to start a child support proceeding and if necessary both states need to work together for collection and enforcement. How this goes will depend on the facts of your case.
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Texas attorney general can get what is reported to Texas workforce commission. Which would be unemployment. You can file and serve him, you child support would be based on what you testify as to what you believe to be his income and then you apply Texas guidelines
You do not need to file for custody, but you should file a suit for paternity and hold support. Please consult a Family attorney in your local area. Many attorneys, like myself, give a free initial consult and can give you clearer guidance based on all the specific facts of your case. Take all documentation with you for review by any attorney you contact, you will get a better assessment of your possible options and outcomes
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You need to have an attorney file what's called a parentage action. This would establish paternity, custody, visitation and child support. An attorney who specializes in family law can easily take care of this for you. To establish his income we can request discovery or subpoena his work records. He is also required to provide his last 2 years tax returns an last 2 paytubs in accordance with Harris county local rules