Three generations of a family appear in "The Singing City" by Michael F. Flynn. The eldest is a retired astronaut [sic], one of many who saved the world from asteroids programmed by ancient aliens to crash into the Earth when humans reached them. His son leads a much more sedate life as a teacher. His own child is about to leave on a voyage to the outer solar system that will keep him away for years.
This is a sophisticated story, balancing a number of futuristic elements with a clear and elegant style. All of the characters are three-dimensional, and their relationships are as real as our own.