The neurofeedback section of my website is currently under development to offer you thoughts and resources for your family. In the meantime, you will find below some excellent resources that will help you better understand Neurofeedback and hopefully answer some of your questions.
Resources you may find helpful
One of the best internet sites where you will find a good overview of Neuofeedback is at the EEG Spectrum website.
Please note the FAQ section as it reflects many questions that people find quite useful when exploring neurofeedback.
If you would like to see a very good video explanation, then I highly recommend this site prepared by Mike Cohen. This video provides a very good overview of neurofeedback ... please enjoy.
https://youtu.be/HxHR7InSQ1c