Old Beer Signs

I will travel abroad with my grandparents, my parents have to give them permission to travel with me?
I have 17 years now, but the trip will turn 18. We travel to various countries owe to my parents to sign a release? Do my parents have to sign a release for me to drink beer as it is not on the trip?
First of all there is no release that their parents can sign for you to drink beer. Drinking ages vary from one country to another and even within regions of a country. When traveling in a foreign country is near the age when they may not be necessary to be wise in your parents must prepare a letter authorizing him to travel with her grandparents for the purpose of traveling to different countries.
Old Style Motion Beer Sign