Have you noticed most of long time couples tend to have more resemblance? Or even your own spouse sometimes mistaken as your sibling?
We tend to be attracted to our own kind. According to research in the journal PLOS Genetics, married couples often appear to resemble each other because of a human tendency to marry someone with the same ancestry, but this trend may be on the wane.
In an earlier study, couples were photographed as newlyweds and then again 25 years later. The resulting photographs illustrate that over time, couples begin to look alike.
Researchers attribute this resemblance to a happy marriage and the close quarters that couples share, which leads them to share facial expressions. This might be a good sign though since research shows that couples who laugh together, stay together. (Reader's Digest)