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    一家人不说两家话 一家人不說兩家話

    yījiārénbùshuōliǎngjiāhuà

    1. lit. family members speak frankly with one another, not courteously, as if they were from two different families (idiom); fig. people don't need to be deferential when they ask a family member for help
    2. people from the same family should stick together (and good friends likewise)

    我们是一家人不说两家话,你有困难就直接告诉我。 Wǒmen shì yījiārén búshuō liǎngjiāhuà, nǐ yǒu kùnnan jiù zhíjiē gàosu wǒ.