My Wife Became a Grandmother (1977)

A middle-aged literature teacher who devotes his free time to poetry is used to being the center of admiration for his family, especially his wife. One day, however, a grandchild arrives at the house, who immediately grabs the full attention of all those around him. The fresh grandfather turns out to be excluded and decides to leave the house, confident that it will restore him to his former position. This is followed by a day full of surprising encounters.