The lines around the nose, the creases in the foreheads, the hairlines and the skin. As youth turns to middle age the genetic truth can't be denied. They were becoming, physically, their father and uncles. The son will frame the pictures his father gave to him that weekend and savor them as he grows older. His own daughter has begun the flight from the nest, and her younger sister and brother will naturally follow the same path all kids follow.
All kids do.
Through those years, his children won't even half glance at those pictures from his father as they sit on a shelf somewhere. If they do give them a second look they will recognize their grandfather but will be unable to keep the other names straight or remember how they are related. That's the way children are. There are long periods in life when people don't have time to care about who they are or where they come from. Eventually, however, if we live long enough, we all want to connect.