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Step 1
Know that the child tax credit is only paid for children who are under 17 years of age and are U.S. citizens or residents.
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Step 2
Determine how long your sibling has lived full-time in your home. To qualify, he or she must have lived with you for more than 6 months. A child that goes to a boarding school or is temporarily absent because of visits to other relatives is still considered to be living with you.
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Step 3
Calculate how much your sibling contributed to his or her own expenses. If he or she received Social Security payments, held a job or received support money from relatives, these count as his or her contribution. To qualify for the credit, your sibling's contribution must be less than half of his or her total living expenses.
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Step 4
Find the tax identification number for your sibling. In most cases, this is the Social Security number. If your sibling doesn't have a tax identification number, you can apply for one through the IRS, either at a local office or online.












