Your post was likely moved here since the people who do brewing for personal use are likely to watch this board. The organic board is used more for students trying to learn in school. The members who post there are typically in a very controlled laboratory environment which is not your situation.
As an aside, your posts appear to be derogatory to home brewing which might have turned off any of our home brewers who might have answered.
There might be a professional brewer who maintains a work environment that may call for monitoring gasses on this forum, but that is probably an outside chance for a response.
Additionally, we have no idea what your family member has in the pot, but if it is products of fermentation then there are all sorts of aldehydes, ketones, alcohols and whatever that could be generated during the boiling. People have been doing this for centuries without any real negative results.
Most of us on this forum are chemistry students or chemistry buffs and would probably not want to play the role of "Dear Abby" to your family situation.
I am impressed with the time members have taken to answer what they can to your request. Maybe there will be more responses, but if not I hope you understand.
As part of our forum rules we encourage people to learn on there own.
To that end I did a GOOGLE of
The chemistry of alcohol production
and got several hits that should be informative.
By the way, if you have not read the forum rules --
Click on the link near the top center of the forum page.
Forum Rules: Read This Before Posting.
http://www.chemicalforums.com/index.php?topic=65859.0