Child Support?

Several issues.

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Support and visitation are entirely separate issues.  Courts have ruled for years that paying child support does not equal buying time with children.  Courts can award visitation and no support or the other way around.  Yes, household income is considered in California.  "Extra" that he pays is NOT child support.  I've seen generous non-custodial parents actually penalized because anything NOT labeled child support is a gift.  Therefore, a man who pays $25 a week but gifts $200 a week is considered to be paying $25 a week.

You are not correct about your income being immaterial; any transfers of money within one year of an Order can be reversed; any hiding of money is a felony.

I would consult with an attorney.  You are putting yourself in a bad light.

The price of admission to visitation with a non-custodial child usually is that you stay current on your child support. Of course she's within her rights to seek more support if her co-parent's income situation has changed. But given that it sounds like you're married to someone without legal immigration status who may or may not even be filing taxes you're definitely going to need a lawyer on this one.

Why is he being so nice to her?  She's being a hard *ss and denying visitation and not allowing him to talk to his son on the phone.  So it doesn't make sense that he is paying her extra.  He should ONLY pay what he has been ordered by the court to pay.  She has every right to apply for a modification.  He's making more money now.  That's appropriate.  That's exactly how it works.  Child support is based on his income.  He's now making more, so he should be paying more.  Your income has nothing to do with his child support issue in "some" states.  In other states, since you are married to him, you could be made to pay his child support if he stops working.  I know someone who that happened to.  Not a welcome surprise.

"We" did not have the amount. You have it. It is yours, not his. They take your income into account so they do not over garnish him.

And how is this your business

Child support and visitation are two different issues..  Neither are dependent on the other.

Child support isnt some "pay to see" deal.

It looks like your income is factores in to determine if you are a dependent of his, or if you are able to contribute to the household.  

Several legal points.  Support and custody/visitation are two entirely different things.  One does NOT hinge on the other.

In California a petition for modification of support can be filed (and heard) every time there is a substantial change in income.

AGAIN - whether or not he sees the child is immaterial.  This isn't "pay to see the child."

If he hands her extra money above and beyond the support order it is a GIFT, not support.

The paperwork asks for your income because the Court wants to know your income.  It's just that simple.  Child support in California uses a formula in which his income AND yours are considered.  Obviously if you are contributing to the household he has more disposable income.  "Where one parent is paying spousal support (alimony) to the other parent, the law provides that in determining the basic guideline child support amount, the court will subtract the amount of spousal support from the gross income of the paying spouse, and add that amount to the gross income of the receiving spouse."

How you file taxes is immaterial.  Why he wants to hide money in a safe is anyone's guess, BUT if he intends to lie in Court about savings/debts/income, you would be an accomplice in fraud.