If a baby is born to a married woman, there is a legal presumption that the child is a "product of the marriage," that is, that her husband is the child's father. One old English case says that this is the strongest presumption in the law (Lord Mansfield's rule, 1777).
But not all children are born to married women.
A paternity suit involves five questions:
1. Is this man (the one named in the petition) the father of this child?
2. (If he is the father) Should HE get custody, or should the mother get custody? In other words, whom should the child live with?
3. How much child support should the non-custodial parent (usually Dad) pay each month?
4. What kind of visitation should be ordered for the non-custodial parent? Should it be restricted in any way?
5. How much retroactive child support (if any) should Dad be ordered to pay? After all, if he is found to be the child's father today, that means he was ALWAYS the child's father, and he's had a duty to support the child all the way back to the child's birth. The Family Code says that there's a presumption that retroactive child support should go back only four years
(§154.131, Texas Family Code). This retroactive amount draws interest at 6% per year.
There may be a sixth question: How much per month should Dad pay toward the retroactive child support (in addition to his regular monthly child support)?
Either parent (alleged parent) can request the Court to order DNA testing.
One also has the right, in a divorce case, to question the paternity of a child born during the marriage.