2 sentences for 家事 (jiā​shì — family matters)

1. 清官难断家事。

   qīng​guān nán duàn jiā​shì.

   Even an upright official finds it hard to settle family disputes.

   Source: Dong Chinese Dictionary

2. 他在背后对别人的家事指点，这样很没礼貌。

   tā zài bèi​hòu duì bié​ren de jiā​shì zhǐ​diǎn, zhè​yàng hěn méi lǐ​mào.

   It is very rude of him to criticize other people's family matters behind their backs.

   Source: Dong Chinese Dictionary