While I agree that the law enforcement/child protection people over reacted, I also wonder about the father.
What parent would not at least check the label before letting their kid drink something. it is not like the hard lemonade bottle looks anything remotely like a bottle of "plain" lemonade?
Parents still do have the responsibility of knowing whether they are handing their kid an alcoholic drink or not.
The fact is that the 7 year old was drinking an alcoholic drink and that aint good.
However, the negligence of the parent, in this situation, does not warrant such a response from the state.