The authors and editors of pages decide what should be linked based on relevance. First, there has to be a Wikipedia article to link to. So if the Wikipedia page on a John Smith said “Mr Smith was taught by his mother, and later by Nelson Mandela”, there’s a Nelson Mandela page you can link to, but there might not be a page for Smiths mother unless she’s also famous, and there’s no reason to link to a more general page about what a mother is, because everybody already knows that. So the mention of Nelson Mandela would be a link, and the mention of Smith’s mother would not
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