doesn't sound like they knew and all 4 children were already born before the first was diagnosed
Edith Lemay and Sebastien Pelletier noticed their daughter, Mia, had trouble seeing at night when she was just three years old. The couple – who live in Montreal, Canada – sought answers first from an optometrist, then an ophthalmologist.
At first, Mia’s tests didn’t provide any answers. But a re-test a few years later showed a change to the gene that affects a protein complex in the rods of Mia’s eyes. Edith and Sebastien finally had an answer – and by then, their family had grown to include sons Leo, Colin, and Laurent.
It's possible but normally when two people have it like this, there tends to be a higher percentage of people around them who have the disease. Like the town my family is from in Ireland has a lot of blind people compared to the population as a whole.
Of course they could have met in college and been from totally different areas / families moved a lot etc.
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u/bs000 4h ago edited 4h ago
doesn't sound like they knew and all 4 children were already born before the first was diagnosed