I am a lurker and have never posted but I was so moved by your plea that I had to respond. I am the parent of teenagers and young adults so I am hoping that I can give you a suggestion that might be helpful.
Are there any of your parents' friends, especially if they have curly hair, that you could go to and discuss this with them? They may be able to talk to your parents and give them some insight on living with curly hair including the care and upkeep of it. I hope that might be helpful.