You’re at a higher risk to get any disease that has a genetic factor the moment your first cell it’s made. Your genes don’t change (basically) so that’s is already determined. So no, your family member getting a disease doesn’t change if you have it. What does happens is now you’re aware that that disease runs in your family genes, so you know the chance you have it is higher than someone whose family doesn’t, but whether you actually have it was already determined when you were born, you just didn’t know it.
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