A lot%
Test it by drinking a lot of wine today
A bottle of wine which contains 5% alcohol by volume is 10 proof. Assuming your child is a teenager this is acceptable. Be sure to read up on your states laws regarding parent provisions for alcohol consumption as related to "minors under twenty-one years of age". Some states permit providing of alcohol on privet property while others do not.
40% alcohol is 80 proof and about the average proof of many hard liquors.
The average alcohol content of wine is about 11%, which translates to about 0.6 oz of absolute alcohol. That is the same amount of alcohol foundin standard servings of beer and distilled spirits. That fact is called alcohol equivalence.
Yes
Generally, yes. There are two schools of thought. Let's look at them. One idea is that you shouldn't cook with something you wouldn't drink. Use the good stuff. The other idea is that there are a lot of "cheap" cooking wines, particularly some from the Pacific rim (China, Viet Nam and the like) that actually have warning labels on them regarding drinking them. (They say not to.) A little sip won't kill you, but the warning is aimed at another group. It's those who would purchase the very cheap wines to substitute them for other "more expensive" ones 'cause they drink a lot of alcohol and they want as much as they can get for as little cash as possible.
Yes, they are both packed with antioxidants (polyphenols). The only difference is that grape juice contains a lot more sugar, and wine contains alcohol.
Alcohol consumption among wine industry workers can range from anywhere between none and a lot. It varies based on personal preference and geographical placement. Culture and gender are also factors.
It is difficult and expensive to refine anything to 100% purity. Best to use 70% as it is just as effective and cost a whole lot less.
No, drinking wine the night before any sort of drug test will not interfere with it. A hair test allows the tester check for drug use over a very long period of time, the only way to mess up the test is to shave your head!
If the point is to make them hate wine, then sure.Boiling removes some of the alcohol but also changes the flavor. I don't really know why you'd go to the trouble of making wine and then boiling it; if you want to give your kids something to drink but don't want them to have alcohol, why not just give them the unfermented juice? They'll probably like it more anyway and it's a lot less work.