In this instance, he is considered a "grandchild", therefore the following applies:
You can claim their children (your grandchildren) that live with you if your son or daughter does not claim them, they live with you more than 1/2 of the year, and your income is higher than your child's income. Dependents are added under the personal info tab.
She is entitled to claim him since it is over six months.. The year requirement applies to other "Qualifying Relatives".
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