Eight Sons (2019)

In the southern Jiangxi region in the 1930s, in this place known as the "red cradle" of the Chinese revolution, there was a mother who sent her eight sons to the Red Army and rushed to the front lines of the battlefield. But the war was ruthless, and six of the brothers died one after another, leaving only the eldest brother Yang Daniu and the youngest child full of cubs.

Unfortunately the movie Eight Sons is not yet available on HBO Max.