"You are the best mom in the entire world. I love you with my whole heart!! ," she said in her second story. Still taken from Harper Murray's Instagram stories (Source: @harpermurrayy/Instagram ...

The title isn't intended ironically in "The Best Mother in the World" - at least not to the extent it is in, say, "The Worst Person in the World." But there's a truism embedded in its hyperbole ...