This case would be very surprising if it got far, couldn't the mother have carried the gene as well? The website linked in the article says it is not always pre

This case would be very surprising if it got far, couldn't the mother have carried the gene as well? The website linked in the article says it is not always presented in characters, and another thing wouldn't they have to test the 13 year old sperm to prove something was wrong with it? Very odd to me.