Kàndào shīsàn duōnián de érzi, lǎomǔ qīn lèirú-yǔxià.
Seeing the son she'd been separated from for years, the old mother's tears fell like rain.
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From Lu You's (陆游) Song-dynasty poem 《闻虏乱有感》: 有时登高望鄠社, 悲歌仰天泪如雨 - 'Sometimes I climb high to gaze toward home, lift my face to the sky in sorrowful song, tears like rain.'
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Literary and emotionally heavy - used in writing for moments of profound grief, reunion, or farewell. In casual speech, simpler phrases like 哭得很厉害 are more natural.