請幫忙翻譯一句諺語,急用!When a father gives to his son,they both laugh.

題目：

請幫忙翻譯一句諺語,急用!When a father gives to his son,they both laugh.When a son gives a

解答：

父爲子付出,雙方皆喜.子爲父付出,雙方皆泣.
可能前一句表示兒子還小
後來父親老了,兒子開始盡孝心,感動和感傷吧.