Statistically speaking, it's not paranoid at all. In fact, it's probably mathematically more likely. Only very specific combinations of blue-eyed genetics can even give the possibility of dark-eyed children. If my math isn't too rusty the probability of two randomly selected blue-eyed people having the right combination of genes to even have the possibility of producing dark-eyed children is about 1.7%. The probability of their children having dark eyes is 25%. The probability of them having three children, all with dark eyes, is around 1.5%. To put that into perspective, if you had 4,000 couples all with blue eyes, and each couple had three children, only one of those 4,000 couples would have three dark-eyed children.