My brothers and I are carriers of a relatively rare genetic disorder. It is highly unlikely to affect us. Our children will be carriers, as will their children, but it probably won’t ever be a real issue. Except for my younger brother. His wife is a carrier of the same disorder.
This doesn’t guarantee that their children would have the disorder. However, there is a relatively high chance that they would be born with this problem and it would severely impact their lives. Instead of trying to get pregnant the traditional way, they, therefore, turned to IVF.