As far as your rights go, spousal income is generally not included in the child support calculation. I already discussed that in the answer to your first question, so, here, I will discuss some of his rights.
The birth certificate creates a presumption of paternity
and with it financial responsibility. However, it is not conclusive. A man who believes he has been misled may still demand a paternity test
and challenging the document on the basis of fraud. Absent that or if it is determined that the child is his, the court will use his income to calculate support. And by income, this includes income he is capable of earning, despite being unemployed. The court may impute at the very least minimum wage.
In some instances, he can request a deviation from child support guidelines
, such as a reduction, suspension or termination, based on circumstances such as disability or hardship. It can also be reduced if it can be shown that the other parent earns more than she claims.