3 mo

Travelling with a minor?

In February my family wants to take a road trip to Turkey, but we want to take a family friend who is 17 with us, I think we're supposed to have some kind of confirmation from their parents, but my questions are:
1. Since we're going through multiple countries do we need a confirmation for all or is one letter mentioning all the countries okay?
2. Can friend's parents write and sign the note on their own or do they need a notary present?
Travelling with a minor?
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