The person claiming your child as their dependent is entitled to the child tax credit. To qualify for the child tax credit, the child must:
- Be your daughter, son, stepchild, eligible foster child, brother, sister, stepbrother, stepsister, half-brother, half-sister, or their descendant.
- Be under age 17 at the end of the tax year.
- Not provide more than half of their own financial support during the tax year.
- Must have lived with you for more than half of the tax year (certain exceptions exist).
- Be claimed as a dependent on your tax return.
- Not file a joint tax return for the year (except when only filing to claim a refund of withheld income taxes or estimated taxes paid).
- Be a US citizen, national, or resident alien.
- Have a Social Security Number issued by the Social Security Administration that is valid for employment.
For more info see the TurboTax article Child Tax Credit.