What is the relationship between Wu Ma and her sister in Sean's 6: 30?

"Sister and uncle", in fact, his identity is not simple. His real name is Ying, and he has appeared in many excellent film and television works, among which Eight Dragons and Mekong River Case are very famous, and Ying himself is also a very powerful actor.

Oh Mom, real name: Wu Yanjie, Chen Xiang's actress at 6: 30. She plays the mother of Ding Hai (played by Wei Li) in the famous TV series Sweet Woman and Love, Just in Time.

The relationship between the two is just a colleague relationship.