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The best trials are double blind, where the subjects and the people running the trials don't know which of the options the patient has given.
In this case the volunteers, and their parents, will have been told the range of options and they will have been told that they won't know what they were given until after the trial is complete. That's when they have their say. They'll be able to drop out at any time and be 'unblinded' but everyone tried to avoid that so they don't get removed from the data.
You've got no reason to say the parents don't get a say, that's a guess on your part and very unlikely to pass an ethics board. But
He's an anti-vaxxer, covid denier, and all round liar. I really don't know why we bother answering him, he ignores all evidence, facts and logic and just goes with some loony ideas he picked up on YouTube or Rumble.