Tax Reform Update: For 2018, you can't claim a personal exemption deduction for yourself, your spouse, or your dependents.
Per IRS Publication 501 Dependents, Standard Deduction, and Filing Information, p. 10:
The term dependent means:
Tests to be a qualifying relative:
See Pub 501 for exceptions to the qualifying relative tests.
For more information on qualifying children, see Rules for Claiming. For instructions on how to enter dependent information in TaxAct, see Add Dependents in Program.