When traveling internationally, it's a good idea to get a consent letter from the parents indicating that you have their permission to travel with your grandchildren. Most likely no one will ask you for it, but you'll be glad to have a hard copy on you in a scenario where you can't get in touch with them.

While not always a legal requirement for domestic travel, it is highly recommended that you carry a formal "Letter of Consent to Travel" signed by both of the child's parents. For international travel, this document is virtually mandatory to prevent international parental child abduction. In 2026, border authorities and airlines frequently ask for this letter, which should include the parents' contact information, the child's passport details, and explicit dates of the trip. Additionally, you should carry a Medical Authorization Form, which grants you the legal right to make healthcare decisions for your grandchild in case of an emergency. Without this, a hospital may be legally unable to treat the minor without a parent's direct consent. Having these documents notarized adds an extra layer of "legal weight" that can prevent significant delays at airport security or customs. Essentially, while you may not be stopped every time, the risk of being denied boarding or held at a border makes these authorization papers a vital part of your travel checklist.