(http://www.bbc.com/future/story/20130712-genetic-portraits-of-families)
Familial relationships offer such a bizarre insight into one's future. One can make inferences into both how their appearance may change as they age, as well as how one's behavior and attitude may change over time. I myself vividly remember the day when I realized I would most likely begin to go gray in my mid to late twenties from the example of my father. The high blood pressure would come later.
For anyone to realize that they have a look alike, biological or otherwise, there is a certain shattering of self-perception, possibly followed by the realization that there is a formula at work, a limited amount of features sent into a genetic algorithm that aligns these traits into a specific combination. Still, there is an errily odd feeling present when looking into the eyes of someone who looks like you and getting a glimpse into the past, present, and future.