Given all of the blacks I have observed in my lifetime, I would say that if there is someone in your family who is the offspring of unmixed negroid ancestry, and has blue eyes, I would have to consider that possible, but statistically akin to a birth defect. No offense meant, and if someone can provide some documentation to the contrary, I will gladly stand corrected.
Actually I was being flippant towards ConsistentLibertarian for trying to put up a meaningless argument.