You can if they qualify to be your dependents:
The tax rules allow you to claim a dependency exemption for a child if they reside with you for more than half the year, don’t provide more than half of their own financial support, and are under the age of 19 at all times during the tax year, or under 24 if a full-time student.
The child is considered to live with the taxpayer while he or she is temporarily away from home due to education, illness, business, vacation or military service. You would select they lived with you all year.
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Rules for Claiming a Dependent on Your Tax Return (2016)
https://turbotax.intuit.com/tax-tools/tax-tips/Family/Rules-for-Claiming-a-Dependent-on-Your-Tax-Ret...
