Tīng dào háizi píng'ān de xiāoxi, fùmǔ zhōngyú kuānwèi le.
On hearing that their child was safe, the parents were finally relieved.
Tips
usage
宽慰 can function as a verb ('to comfort someone') or as an adjective ('feeling relieved'). Compare 安慰 (ānwèi), which is more commonly used in everyday speech; 宽慰 carries a slightly more literary tone.