Your child's rent is not the determining factor as to whether you can claim them as a dependent. If the child is not a student under the age of 24, then the determining factor is whether they had over $4300 of income. If they did, then you cannot claim them as a dependent.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-credits-deductions/claim-dependent/L...
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