Actually, in many states parents CAN give consent for their children to have alcohol.
For example, section 4301.69 of the Ohio Revised Code states
"Except as otherwise provided in this chapter, no person shall sell beer or intoxicating liquor to an underage person...unless the underage person is supervised by a parent, ..." (Quote abbreviated for brevity, but the elided portion doesn't change the meaning)
For example, section 4301.69 of the Ohio Revised Code states "Except as otherwise provided in this chapter, no person shall sell beer or intoxicating liquor to an underage person...unless the underage person is supervised by a parent, ..." (Quote abbreviated for brevity, but the elided portion doesn't change the meaning)