Qīn zé bù xiè; xiè zé bù qīn.

親則不謝, 謝則不親。

Lit [If people have] close relations, then no thanks [are necessary]; [if] thanks [are expressed] then [the relationship is] not close.

Fig If you are close relatives, there is no need for formality between you; otherwise the relationship is distant.

Note [Note: Chinese traditionally do not express thanks to immediate family members in their daily life.]

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