April fools trivia

Kate's mother has three children: yesterday, today and_______________

What is the the mistake: 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40

There is only one word in the dictionary that is spelled wrong: what is it?

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