2 sentences for 孝 (xiào)

1. 他正为去世的祖父穿孝。

   tā zhèng wèi qù​shì de zǔ​fù chuān xiào.

   He is in mourning for his late grandfather.

   Source: Dong Chinese Dictionary

2. 百善孝为先。

   bǎi shàn xiào wéi xiān.

   Of all virtues, filial piety is the most important.

   Source: Dong Chinese Dictionary