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What is the relationship among Mao Mengda (Ade), Chen Guoqing (A Qing) and Yao Qier (Drummond) in Shanghai farce?

The three of them belong to different comic troupes. Mr. Mao is the Shanghai People's Repertory Theatre, Mr. Wang is the Shanghai Repertory Theatre, and Mr. Yao is the eldest son and nephew of the crosstalk master, belonging to the Shanghai Qingyi Repertory Theatre. The cooperation of the three of them originated from the famous TV sitcom "Old Man" of Shanghai Oriental TV Station. Through this comedy, the brotherhood of three people was promoted.