George (Steve Martin Steve Martin) finally accepted the fact that his daughter was married and thought life would be calm again. Unexpectedly, the news of her daughter's pregnancy made George anxious again. The daughter's pregnancy not only means that she will enter a new stage in her life, but also means that George is old enough to become a grandfather, and a deep sense of crisis permeates George's heart. I do not know whether it is a blessing or a curse, George's wife Nina (Diane Keaton Diane Keaton) is also happy, one is the grandfather, the other is the father, can George, who is so troubled by the two identities, take up his responsibility? At such a juncture, George, who did not know what was wrong, put his energy into proving that he was still "not old".