A thought experiment: in the USA, a minor's assets belong to the parents, right? So, ipso facto, the parent holds the copyright. What if the parent refuses to

A thought experiment: in the USA, a minor's assets belong to the parents, right? So, ipso facto, the parent holds the copyright. What if the parent refuses to allow a copy to go to Turnitin? Further, minors cannot enter into contracts. Would Turnitin's license agreement be a contract, and hence void since one of the parties was a minor?