Here's an interesting comment posed by someone in the comment section of the article:
$1:
"Maybe, just maybe, her sister brought this lady's son to Canada and pretended to be hers since she probably had valid immigration papers. This lady then tried to use her sister's passport, perhaps, to enter Canada. hence the inconsistencies. When they did DNA, of course there was a match with the son already in Canada.
Things to make you go hmmmm.