1. The child must be your son, daughter, stepchild, foster child, brother, sister, half-brother, half-sister, stepbrother, stepsister, or a descendant of any of them.
2. The child must be (a) under age 19 at the end of the year and younger than you (or your spouse if filing jointly), (b) under age 24 at the end of the year, a student, and younger than you (or your spouse if filing jointly), or (c) any age if permanently and totally disabled.
3. The child must have lived with you for more than half of the year.
4. The child must not have provided more than half of his or her own support for the year.
5. The child must not be filing a joint return for the year (unless that joint return is filed only to claim a refund of withheld income tax or estimated tax paid).
Relatives who don't have to live with you. A person related to you in any of the following ways doesn't have to live with you all year as a member of your household to meet this test.
Your child, stepchild, foster child, or a descendant of any of them (for example, your grandchild). (A legally adopted child is considered your child.)
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The person can't be your qualifying child or the qualifying child of any other taxpayer.
The person either (a) must be related to you in one of the ways listed under Relatives who don't have to live with you, or (b) must live with you all year as a member of your household (and your relationship must not violate local law).
The person's gross income for the year must be less than $4,150.
You must provide more than half of the person's total support for the year.
Gross income means all income the person received in the form of money, goods, property and services, that isn’t exempt from tax. Don’t include social security benefits unless the person is married filing a separate return and lived with their spouse at any time during the tax year or if 1/2 the social security benefits plus their other gross income and tax exempt interest is more than $25,000.If your meets either of these requirements (Qualifying Child or Qualifying Relative), you claim him on your taxes.