File a paternity suit to legally establish the parent-child relationship. The court (not a jury) will determine whether a legal relationship exists between the father and child.
Yes. An informal marriage has the same legal consequences as a ceremonial marriage and can only be terminated by death, divorce, or annulment.
My child’s parent chooses not to work or chooses to work in a less lucrative field than he is capable of. Am I obligated to accept the low amount of child support?
No. The Texas Family Code presumes that an obligor is able to work 40 hours per week at the rate of the federal minimum wage. See Texas Family Code §154.068.