(Strip Number 4351, Original Publication Date, 28 July 1983)
Panel 1: As the sow gives birth, an astonished Elly says "Oh, my gosh! There's the first baby pig already!"
Panel 2: She then asks "Just like THAT? The sow feels a contraction, she lies down and POP!!, a baby is born?"
Panel 3: Danny confirms that that's all there is too it.
Panel 4: He then stands there with a puzzled look on his face because his brother-in-law's wife complains about how not fair it is.
Summary: This is owing to his not quite realizing who he's dealing with. A man who knew her better would realize that she uses the discomfort of bringing her children into the world as a bludgeon to beat them and John over the head with when they displease her.