You would not put their income on your return. If they are required to file a return, they would file their own return and check that someone else can claim them on their tax return. You would need to create a separate account for each one.
If your your dependent's W-2 earnings exceed his/her standard deduction ($6,300 in 2016), they should file their own return and report the W-2 on their return.
Do I need to file my own taxes if I'm a dependent?
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