No one else should be writing your essays. And how do your parents even know what edits the GC has suggested? Meet with the GC without your parents to get the suggestions on your essays. Decide which advice to take. Submit the essay as you want to after that. (You might tell your GC that your parents are interfering with your essay process, and that you feel it is unethical given that they are supposed to be your essays – the GC may be able to get them to back off).