3 sentences

1. 他是协会理事的儿子。

   tā shì xié​huì lǐ​shì de ér​zi.

   He's the son of an association director.

   Source: OpenSubtitles

2. 他被选为该慈善基金会的理事。

   tā bèi xuǎn wéi gāi cí​shàn jī​jīn​huì de lǐ​shì.

   He was elected as a director of the charitable foundation.

   Source: Dong Chinese Dictionary

3. 他整天忙于理事，很少回家。

   tā zhěng​tiān máng​yú lǐ​shì, hěn shǎo huí​jiā.

   He is busy managing affairs all day and rarely comes home.

   Source: Dong Chinese Dictionary