Your wife can use the $8300 limit because the IRS treats married couples as a single tax unit, which means you must share one family HSA contribution limit of $8,300 if you are on the same health policy. If you and your spouse each have your own self-only coverage, you may each contribute up to $4,150 annually into your separate accounts.
If you're married filing separately, the child tax credit is not available for the total amount you'd receive if you filed jointly. You can take a reduced credit that's equal to half that of a joint return. Also, you would be ineligible for the child and dependent care credit.
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