Your question is a bit confusing.
Canadian citizens don't need visitors visas.
Although other ID is acceptable, it would be best to get him a Canadian passport.
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You can make the application for a visitor visa. Assuming you can document why his mother cannot enter the U.S., that will be a strong piece of evidence in obtaining the visitor visa. Remember, visitor visa applicants must overcome the rebuttable presumption that they intend to stay and live in the U.S. Showing that he intends to return to his home in Canada with his mother and not live in the U.S. will be the critical inquiry.
You may request the visitor's visa, but consular officers have ample discretion at the time of adjudication, and any decisions cannot be appealed. I agree with attorney Capriotti, if he is a Canadian citizen better to get him a Canadian passport.
What is the citizenship of your step-son? If he is a citizen of Canada, and if he has a Canadian passport, he could enter the United States with his Canadian passport (no visa required), unless he has some criminal history that might make him inadmissible to the United States.
If your step-son is not a citizen of Canada, but rather of some other country, then he could apply for a visitor visa to enter the United States. But at this point I don't know what his citizenship is.
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It is possible but you would have to "prove" his intention to return be up e discretion of the consular officer. If your stepson is a Canadian citizen, why not use his Canadian passport to enter since no visa would be required?
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