I, ______________________________________________ (name of parent), am the ______ (mother) ______ (father) of __________________________________ , aged ____________ , and do hereby give my consent for (him)(her) to travel with __________________________________________________________________ (name/address of traveling ...
I am writing to give my consent for my child, (Child's Name), to participate in the upcoming school trip to (Destination) on (Date). I understand that the trip will involve (briefly describe activities, if known), and I agree to all the planned activities. Details: Trip Destination: (Destination)
The letter of consent, preferably in English and notarized, from the other parent (if the child is traveling with one custodial parent) or signed by both parents (if the child is traveling with a guardian or alone) should say: "I acknowledge that my child is traveling outside the country with the name of the adult ...
You should obtain a child travel consent letter granting you permission from the absent parent to leave the country with your child (having it notarized is not required, but highly recommended).
Each parent can travel with each child, just like you could domestically. No special permission or documentation is required. If you know your situation would look suspicious to foreign officials, then of course you can bring stuff to help them understand better.