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Daughter-in-law can't fart in front of in-laws? Previous requirements?

Farting in public is always considered uncivilized or embarrassing, let alone farting in front of in-laws.

As the saying goes, eating whole grains does not fart. Fart is the gas of whole grains. There is no restrictive "requirement" before "farting in front of in-laws", just a folk agreement.