You'll need to report the income that you earn on your tax return.
In other instances your daughter would have to issue you a W2 and create a household employee but since you are the child's grandparent your daughter doesn't have to do that. You will report this income NOT as self-employment income but as 'Other Income'.
Scroll down to the bottom of the 'Wages & Income' section and enter the amount that you receive as miscellaneous income under the last entry - 'Other Reportable Income'. For a description you can enter 'Grandparent caring for Grandchild'.
Here is another thread dealing with the same issue.
@Laurie2485
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