Child Claim other child as a dependent

[Jac123]

Can my son lived with me in the same house claim my other child as a dependent if he supports him?

[Bsch4477]

He can do that only if you can’t claim him or if both of you are eligible to claim him but he has a higher AGI than you, the parent, does. 

[Jac123]

Thanks, @Bsch4477 
So if I (the parent) can claim him but my son have a higher AGI, he is also eligible?

[Opus 17]

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@Jac123 wrote:

Thanks, @Bsch4477 
So if I (the parent) can claim him but my son have a higher AGI, he is also eligible?

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Generally, yes, that's how the tiebreaker rules work. When two people could claim a person as dependent, but only one of them is a parent, the parent always comes first.  If the parent decides not to claim the child, the other person can only claim them if their income is higher than the parent's income.

For Adam to claim his sibling Bob as a dependent:

1. Adam must be older than Bob.

2. Adam and Bob must live together in the same household for more than half the year.

3. Bob must be under age 19, or be a full time student under age 24.

4. Bob must not provide more than half of his own support.

5. No one claims Adam as a dependent.  (A person who is claimed as a dependent can't have their own dependents.)

6. If Adam and Bob live together in the same household as their parent (biological, foster, adoptive or step), then Adam can only claim Bob if:

6a. The parents don't claim Bob.

6b. Adam's AGI is higher than his parent's AGI.

[NCperson]

best to run your scenario through the IRS dependent tool

answer the questions as if you were your son. it will tell you

https://www.irs.gov/help/ita/whom-may-i-claim-as-a-dependent