This makes sense in my head, let's see if I can describe it. With your cat photo you have a foreground, mid and background present so you are going to blur the foreground given your focal point.
With your sister's photo you have no foreground since you are standing directly in front of her. Her entire body is in the same plane so it is all in focus. The cat, floor and background are all on different planes so you get a different focus with each.
Does that make sense?
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