No, they're still looking for the missing boater. This was a different boat they found overturned.

>They are believed to be an Indian family and a Romanian family who were attempting to cross into the U.S. from Canada illegally, according to police.

https://www.cbc.ca/news/canada/montreal/akwesasne-st-lawrence-bodies-found-missing-people-1.6797256

Probably the little boy was born in Canada (birth tourism is a thing) but the rest of the family weren't eligible for immigration in any of the legal ways, so they tried going to the US.