From the International Craniofacial Institute's web page on cleft palate.
What they say:
Statistics reassure us that having a child with a cleft does not mean you’ll have other children with the same condition. In fact, your chances only increase by 2 to 5 percent compared to couples with no cleft-affected children.
What they mean:
The chances that your next child will have cleft palate increases from 0.15% to about 4%. Your odds ratio multiplier is 25.
"Someone with a cleft palate has 25 times as great a chance of having a child with a cleft palate, as someone without a cleft palate does."
Rationality quotes are self-explanatory. Irrationality quotes often need some context and explication, so they would break the flow in Rationality Quotes.