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@gwtxcpa wrote:

My concern was would the service wonder/challenge the child's support by parent 

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Support does not matter at all.  In fact, even if the child provided over 1/2 of his own support (which would disqualify him from being a dependent), the parent could still claim EIC because EIC specially says that support does not matter.

However, if much of the child's money was used for support, you may want to fill out the Support Worksheet to see if the parent is eligible to claim the child as a dependent.  But as I mentioned above, that would not affect EIC.

https://apps.irs.gov/app/vita/content/globalmedia/teacher/worksheet_for_determining_support_4012.pdf