In which poem is turning to a weak father?

It's Bai Juyi's Farewell to Ancient Grass. This poem depicts the growth and withering of vegetation on the ancient plains and expresses the impermanence and change of life. Poets express their feelings of parting and yearning by describing the natural landscape. Bai Juyi was a famous writer, politician and poet in Tang Dynasty, and was called Shi Gui. His poetry works involve many fields, such as nature, life, love, politics and so on. With profound ideological and emotional connotations, it has had a far-reaching impact on China's ancient literature and culture.