1: What do you do if your parents are drunk?
Depending on your age, if you are young you could get your relatives involved and have them assist in an intervention, rehab, etc... Otherwise you could steamroll that yourself.
2: What do you if you meet a drunk person?
Assuming you don't know the person call the police, they will lock them up for the night to ensure the drunk's safety and everyone else’s. If you know them then take them home.
3:What is your opinion about this subject?
I can't relate to it so I have none.
4:How should this be taken care of?
Outlawing alcohol would reduce a vast majority of it.