And that means we have a 0.5 likelihood. Now, because these two events are actually they do not depend on one another. They're independent. What that means is to calculate the actual probability, we have to multiply these two out. This is known as the product law. So if we multiply zero five by 0.5, we get zero point 25, which means there is a 25% likelihood that if these two individuals have two children, that both of those children will actually be normal.