http://travel.state.gov/visa/temp/types/types_1274.html#11
Canadian citizen spouses and children do not need visas, but they must have the following documents at the port of entry:
Proof of Canadian citizenship;
Proof of relationship to the principal applicant, such as marriage certificate and birth certificate; and
Photocopies of entry documents of the principal applicant.
Canadian citizen spouses and children do not need visas, but they must have the following documents at the port of entry:
Proof of Canadian citizenship;
Proof of relationship to the principal applicant, such as marriage certificate and birth certificate; and
Photocopies of entry documents of the principal applicant.