Many parents claim, “I’d rather my child drink with us at home than out with their friends.” Depending upon the state in which you reside, this may or may not be a legal practice. However, when hosting your child’s friends, NO state in the USA allows for that activity without their parent/legal guardian being present.
Excellent Article: http://drinkingage.procon.org/view.resource.php?resourceID=002591
Ohio Revised Code: http://codes.ohio.gov/orc/4301.69