Who is the grandfather of actor Geng Le?

His grandfather is a famous painter, but his surname is not Zhang, because he has four sons and one daughter with his ex-wife Chen Buwen. During the Yan 'an period, due to the need of work, the eldest son was entrusted to Geng Hong (Minister of Yan 'an City Department and Director of Shanxi Public Security Department after liberation). Geng Hong, who has no children, changed his surname to Geng, a famous soldier, graduated from Harbin military industry and now lives in the United States. Chen Buwen died in 1985. Geng Le, the son of Geng Jun, was born after 70. His mother, surnamed Wu, is the daughter of a famous musician.