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Oklahoma has specific income requirements for dependents you are claiming.  The limits are (from the Instructions for 2021 Oklahoma Resident Individual Income Tax):

Chart B: Oklahoma Filing Requirements for Children and Other Dependents If your parent (or someone else) can claim you as a dependent, use this chart to see if you must file an Oklahoma return. You must file a return if your gross income exceeds the amount shown.

If your dependent earned income enter that amount and if they did not earn any income enter 0.