Father's portrait implies
Mother and son have been looking for their husband and father with portraits. It's been 30 years, and compared with the portraits 30 years ago, it's not surprising that they can't recognize their relatives, which shows that things are not static, they are constantly developing and changing, and they can't follow the old rules.
The authenticity of father's portrait
Tell us to be modest and prudent, to be a grateful person, and to be generous and not hold grudges. Through the memory of his father, the full text outlines his life image of hard struggle and hard struggle, and shows the author's nostalgia and respect for his father.