могут и при выезде спросить Travel with or by childrenhttp://www.voyage.gc.ca/countries_pays/report_rapport-eng.asp?id=308000#4Any adult travelling with children may be required to show evidence of parental/custodial and/or access rights, or to provide evidence that he or she has the consent of the parents, legal guardian, and/or the court to travel with the children. Children may be refused to enter or, in some cases, leave the U.S. without proper documentation such as a consent letter or a court order.Minors (under 18 years old) travelling to the United States alone or with only one parent or another adult must present a certified consent letter proving that the trip is permitted by both parents.If there is a possibility of a custody dispute arising over your child while you are away, you should consult a Canadian lawyer before leaving.