<p>Here’s one for you which is a summary. It’s broken down by private residence with supervision without parental consent and with parental consent (along with other exceptions, such are religious purposes, etc). Laws vary by state.</p>
<p><a href=“State-by-State MLDA Exceptions - Drinking Age - ProCon.org”>http://drinkingage.procon.org/view.resource.php?resourceID=002591</a></p>
<p>On private, non alcohol-selling premises,
without parental consent in 6 states
Examples: Private home, private office, or private property without parental consent or presence
Louisiana, Nebraska, Nevada, New Jersey, Oklahoma, South Carolina</p>
<p>On private, non alcohol-selling premises, with parental consent in 29 states
Examples: private home, private office, or private property with parental presence and consent
Alaska, Colorado, Connecticut, Delaware, Georgia, Illinois, Iowa, Kansas, Louisiana, Maine, Maryland, Massachusetts, Minnesota, Mississippi, Montana, Nebraska, Nevada, New Jersey, New Mexico, New York, Ohio, Oklahoma, Oregon, South Carolina, Texas, Virginia, Washington, Wisconsin, Wyoming</p>
<p>So those are your 6 states that allow a parent to provide alcohol to someone under 21 who isn’t their own child and without the other child’s parent’s consent.</p>
<p>(With parental consent means either direct supervision or by consent of a parent who is not in direct supervision of their own kid,)</p>