Do you mean a 1099NEC? A 1 099A is for Acquisition or Abandonment of Secured Property.
No that won't affect someone from claiming them as a dependent. But they may have to file a return. Be sure on the child's return they check the box that says they can be claimed on someone else’s return.
Filing requirements for a dependent
https://ttlc.intuit.com/community/children-dependents/help/do-i-need-to-file-my-own-taxes-if-i-m-a-d...
