清官难断家务事

清官難斷家務事
qīngguānnánduànjiāwùshì
even an honest and upright official will have difficulty resolving a family dispute (proverb)

CEDICT

even upright officials find it hard to settle family quarrels

Wiktionary

（谚语）家庭纠纷繁琐複杂，即使是公正廉洁的官吏也难以论断是非。

重編國語辭典

他人不瞭解实际的情况，不能够介入其中。

維基詞典

Entry Composition

1 清官 qīngguān honest and upright official (traditional)
2 难 nán
  1. difficult (to...)
  2. problem
  3. difficulty
  4. difficult
  5. not good
3 断 duàn
  1. to break
  2. to snap
  3. to cut off
  4. to give up or abstain from sth
  5. to judge
  6. (usu. used in the negative) absolutely
  7. definitely
  8. decidedly
4 家务 jiāwù
  1. household duties
  2. housework
5 事 shì
  1. matter
  2. thing
  3. item
  4. work
  5. affair

classifiers: 件, 樁, 回