The rule is that if a child CAN be claimed they are supposed to say on their own tax return that they can be claimed as someone else's dependent. Doing otherwise is a form of tax fraud, which you surely do not want to encourage your child to do.
https://ttlc.intuit.com/community/dependents/help/when-do-i-have-to-answer-yes-to-being-claimed-as-a...
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