My grandson lives with me his father claims him he is full time student

[AlanT222]

Who is the full-time student, your grandson or the father?

[edjm1971]

If you do not have it in writing / court documents / that you are the only person that can claim your grandchild for tax purposes then your son is in full right to do so. Not saying I agree, I'm just saying that he is legally allowed to do so.

[VictoriaD75]

Per tie breaker rules with the IRS when more than one person is claiming a dependent:

If only one of the persons is the child’s parent, the child is treated as the qualifying child of the parent.

Review the information found in Section C, Dependents in Publication 4012 below. There are some helpful charts in determining who may claim a dependent. Also see the TurboTax link below that outlines rules for claiming dependents.

Publication 4012

Rules for Claiming a Dependent

[Caseytaxs17]

.....

[fanfare]

@jashuaj1990  when the child is in college, they are considered to be living at home, so the parent would claim him not you.